Q. A train of $150\ m$ length is going towards north direction at a speed of $10m/\sec$. A parrot flies at the speed of $5\ m/sec$ 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) $10\ sec$
Explanation
(d) Relative velocity
$= 10 + 5 = 15\ m/sec$
$\therefore t = \frac{150}{15} = 10\ sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.