Question

A train of 150 meter length is going towards north direction at a speed of $10m/\sec$. A parrot flies at the speed of $5m/\sec$ towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

• A. 12 sec
• B. 8 sec
• C. 15 sec
• D. 10 sec

Answer 1

Answer: (D)

10 sec

Answer 2

Relative velocity $= 10 + 5 = 15\mspace{6mu} m/sec$

$\therefore t = \frac{150}{15} = 10\mspace{6mu}\sec$