Question

A train running at the speed of 72km/hr goes post a pole in 15s. what is the length of the train

Answer 1

we know D=ST

given speed in terms in km/hr. we have to convert into m/sec because time is given in seconds.

72(5/18) = 20 m/sec

Here length of train is nothing but distance .

D=ST

D=20*15

=>D=300 m