Question

train a of length 100 metre cross a pole in 4 second train B approaching train a with speed of 15 metre per second cross it in 9.1 second find the length of B​

Answer 1

Length of train A 100m

Time taken by it to cross a pole 4sec

Speed= distance ÷ time

Here distance covered is the length

Of the train = 100m

Time =4sec

Speed = 100m ÷ 4sec = 25m/s

Speed of train b 15m/s

Time taken to cross the pole 9.1sec

Distance = speed×time

Speed =15m/s × 9.1sec = 136.5m Ans.