Question

A train of $150m$ length is going towards north direction at a speed of $10m{s}^{-1}$. A parrot flies at a speed of $5m{s}^{-1}$ towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to:

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

Answer 1

The correct option is D 10 s

Velocity of train and parrot are in opposite direction w.r.t to ground
$\text{Time taken}=\frac{\text{distance}}{\text{Relative velocity of parrot w.r.t train}}=\frac{150}{15}s=10s$