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A train overtakes two boys walking along a railway track. The first one walks at 3.6 kmph. The other one walks at 5.4 kmph. The train takes 7.5 and 7.8 seconds respectively to overtake them. What is the speed of the train if both the boys are walking in the same direction as the train?
3.6 kmph = (3.6 ×5/18) m/sec = 1m/sec and
5.4kmph = (5.4×5/18)m/sec = 1.5m/sec
Let the speed of the train be x m/sec
Then, (x-1)×7.5 = (x-1.5)×7.8
7.5x - 7.5 = 7.8x - 11.7
0.3x = 4.2
x = 14
Speed of the train = 14×18/5 kmph
= 50.4 kmph
By: bhavesh kumar singh ProfileResourcesReport error
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