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Question

Two trains are moving in the same direction at the speed of 52 km/h and 34 km/h. They completely pass one another in one minute. If the length of the first train is 175 metres, then what is the length of the second train?



Your Answer
A

120 metres

Your Answer
B

130 metres

Your Answer
C

142 metres

Correct Answer
D

125 metres


Solution

The correct option is D

125 metres


Relative speed of trains = (52 - 34) = 18 km/h

= 18×518 = 5 m/s

Let the length of the second train be x metres

Distance to be covered by trains to completely pass one another = 175 + x

Speed = distancetime

5 = 175+x60

300 = 175 + x

x = 300 - 175 = 125 m

Length of the second train is 125 metres

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