Problems on Trains- Aptitude Questions and Answers

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A train 100 meters long moving at a speed of 40 km/hr crosses a train 130 meters long coming from the opposite direction in 6 seconds. Find the speed of the second train?

A)

98 km/hr


B)

96 km/hr


C)

94 km/hr


D)

90 km/hr



Correct Answer :

98 km/hr


Explanation :

Time taken to cross= 6 sec = 6/3600 sec = 1/600 hr
Let the speed of the second train be X km/hr
Relative speed = 40 + X km/hr (opposite directions)
Distance covered = 100 + 130 = 230 m = 0.23 km

Time taken to cross= Distance covered/Relative speed
1/600 = 0.23 / 40 + X
40 + X = 138
X = 98 km/hr

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