1. Home
  2. Quantitative Aptitude
  3. Boats and Streams
NumbersHCF and LCMFractionsSimplificationSquare and Cube RootAverageProblems on AgesSurds and IndicesPercentageProfit and LossRatio and ProportionPartnershipTime and WorkPipes and CisternTime and DistanceProblems on TrainsBoats and StreamsAlligation or MixtureSimple InterestCompound InterestLogarithmAreaVolume and Surface AreaRaces And GamesCalendarClocksPermutation and CombinationProbabilityDiscountHeight and DistanceAlgebraTrianglesTrigonometryQuadrilateral

Boats and Streams- Aptitude Questions and Answers

View in English View in Hindi

If a man rows at 5 km/hr in still water and 3.5 km/hr against the current,then his rate along the current is ?

A)
8.5 km/hr

B)
6.5 km/hr

C)
6 km/hr

D)
4.25 km/hr


Correct Answer :

6.5 km/hr


Explanation :

If The speed of boat or boatman in calm water is u kmph and The speed of water or stream is v kmph, then:In water, the speed along with stream= (u + v) kmph

Speed of current = 5 - 3.5 = 1.5 km/hr.

So the speed of man along the current = 5 + 1.5 = 6.5 km/hr

The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr. The speed of the boat upstream is ?

A)
13.5 km/hr

B)
16.5 km/hr

C)
12 km/hr

D)
8.25 km/hr


Correct Answer :

12 km/hr


Explanation :

If The speed of boat or boatman in calm water is u kmph and The speed of water or stream is v kmph, then:
Speed downstream= (u + v) kmph , In water, the speed along with stream
Speed upstream = (u - v) kmph ,In water, the speed against the stream

15= u + 1.5
⇒ u = 13.5

Speed upstream, u - v = (13.5 - 1.5) km/hr = 12 km/hr

A boat goes 14 km upstream in 56 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is ?

A)
6 km/hr

B)
15 km/hr

C)
14 km/hr

D)
17 km/hr


Correct Answer :

17 km/hr


Explanation :

Speed upstream Speed(S) = Distance(d)/Time(t) = 14/56 km/min = 14*60/56 km/hr= 15 km/hr

If The speed of boat or boatman in still water is U kmph and The speed of water or stream is V kmph, then:
Speed upstream = (U - V) kmph ,In water, the speed against the stream
15 = U - 2
So speed of boat in still water , U = 17 km/hr

A man can row upstream 32 km in 4 hours. If the speed of current is 2 km/hr, find how much he can go downstream in 6 hours ?

A)
70 km

B)
72 km

C)
64 km

D)
81 km


Correct Answer :

72 km


Explanation :

Upstream Speed(S) = Distance(d)/Time(t) = 32/4 km/hr= 8 km/hr

If The speed of boat or boatman in still water is U kmph and The speed of water or stream is V kmph, then:
Speed upstream = (U - V) kmph
8 = U - 2
Speed of man in still water,U = 8 + 2 = 10 km/hr

Speed of man in downstream = (U + V) kmph = (10 + 2) = 12 km/hr
Now, man cover the distance in 6 hours = 12 * 6 = 72 km

A man can row upstream at 15 km/h and downstream at 21 km/h. The speed of water current of the river is ?

A)
8 km/h

B)
6 km/h

C)
3 km/h

D)
5 km/h


Correct Answer :

3 km/h


Explanation :

If the speed downstream is x kmph and the speed upstream is y kmph, then:
Rate of stream = 1/2 (x - y) kmph.

= 1/2(21 - 15) km/h
= 3 km/h

A man rows downstream 60 km and upstream 36 km, taking 4 hours each time. The speed of the man is :

A)
15 km/h

B)
16 km/h

C)
8 km/h

D)
12 km/h


Correct Answer :

12 km/h


Explanation :

If the speed downstream is x kmph and the speed upstream is y kmph, then:
Speed in still water = 1/2 (x + y) kmph.

x = 60/4 =15 km/h
y = 36/4 = 9 km/h
speed of the man = (15 + 9) / 2 = 12 km/h

The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is?

A)
1.2 km

B)
1.8 km

C)
2.4 km

D)
3.6 km


Correct Answer :

3.6 km


Explanation :

Speed Downstream = (15 + 3) km/hr = 18 km/hr.

Distance travelled =(18 * 12 / 60 )hrs = 3.6 km

The speed of a boat in downstream is 12 km / h and in upstream is 8 km / h. The time taken by boat to cover 24 km in still water?

A)
2 hours

B)
3 hours

C)
2.4 hours

D)
1.2 hours


Correct Answer :

2 hours


Explanation :

If The speed of boat or boatman in still water is U kmph and The speed of water or stream is V kmph, then:
Speed upstream = (U - V) = 8 km/hr
Speed of man in downstream = (U + V) kmph = 12 km/hr

After solving above equations 2*U = 20 km/hr
speed of boat in still water is,U = 10 km/hr

Required time = 24 / 10 = 2.4 hr

Relevant links

Boats and Streams - Important Formulas,Tricks and Examples

Latest Updates

Area

If the area of a square is 16 cm2, then the area of the square joining the mid-points of the sides is?
General Knowledge of MP

Vidisha is situated on the banks of river?
General Knowledge of World

When is the Human Rights Day celebrated?
Profit and Loss

By selling coconuts at the rate of Rs. 6/- each, a trader gained 20%. Find the cost of 100 coconuts?
General Knowledge of India

How many coastal state are in India?
Numbers

A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = .... = a10 = 150 and a10 , a11 ,... are in an AP with common difference – 2, then the time taken by him to count all notes is ?

The value of product 6 1/2 * 6 1/4 * 6 1/8 * 6 1/16 * -----∞ upto infinite terms?
Unix/Linux

What is nohup command in unix?

How do display the 10th, 11th and 12th line of a file in Unix?
Average

The mean of 100 students marks was found to be 40. it was found later that a mark 53 was read as 83. the correct mean is?
Numbers

The geometric mean of three observations 40, 50 and X is 10, then the value of X is ?
Indian Politics

Who appoints the members of National human rights commission?

The President of India can resign by writing under his hand addressed to?

Under which article of the constitution of India can the President of India refer a matter to the Supreme Court for its opinion?
General Computer Knowledge

The term VPN stands for ?

The transmission control protocol(TCP) is a............ layer protocol ?
Oracle PL/SQL

What is the difference between Procedure and Function?

Define exception and How will you raise an exception in PL/SQL procedure?

Latest Job Notifications

Banking Jobs

Reserve Bank of India (RBI) - 841 Posts - 15/03/2021 Last date

Institute of Banking Personnel Selection (IBPS) - CRP SPL-IX - 1163 Posts - 26/11/2019 Last date
Government Jobs

Reserve Bank of India (RBI) - 199 Posts - 11/10/2019 Last date

Life Insurance Corporation of India (LIC) - 7942 Posts - 01/10/2019 Last date
Banking Jobs

State Bank of India (SBI) - CRPD/APPR - 700 Posts - 06/10/2019 Last date
Jobs in Jharkhand

Jharkhand Staff Selection Commission (JSSC) -JANMCE - 1985 Posts - 04/10/2019 Last date
Jobs in Madhya Pradesh

National Health Mission (NHM) - 1392 Posts - 05/10/2019 Last date
Jobs in Bihar

Bihar Vidhan Parishad - 136 Posts - 11/10/2019 Last date
Banking Jobs

NABARD - 91 Posts - 02/10/2019 Last date

Institute of Banking Personnel Selection (IBPS) - CRP Clerks-IX - 12075 Posts - 09/10/2019 Last date