A train of `150 m` length is going toward north direction at a speed of `10 ms^-1`. A parrot flies at a speed of `5 ms^-1` toward south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to.

Options

A. 12s
B. 8 s
C. 15s
D. 10s

Answer

D

Explanation

So by figure the velocity of parrot w.r.t train is `= 5- (-10)= 15 m//sec` so time taken to cross the train is `=("length of train")/("relative velocity") = (150)/(15) = 10 sec`