Question

A train overtakes two persons who are walking in the same direction in which the train is running, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. the length of the train (in metres) 72 45

Answer 1

4 kmph =4 x5m/sec =10m/sec.189

Let the length of the train be x metres and its speed by y m/sec.

Then,x= 9 andx= 10.y -59y -109

 9y - 5 = x and 10(9y - 10) = 9x

 9y - x = 5 and 90y - 9x = 100.

On solving, we get: x = 50.

 Length of the train is 50 m.