Q. A $150\ m$ long train is moving with a uniform velocity of $45\ km/h$. The time taken by the train to cross a bridge of length $850\ m$ is
A) $56\ sec$
B) $68\ sec$
C) $80\ sec$
D) $92\ sec$
Explanation
(c) Total distance to be covered for crossing the bridge
$=$ length of train $+$ length of bridge
$= 150m + 850m = 1000m$
Time $= \frac{Distance}{Velocity} = \frac{1000}{45 \times \frac{5}{18}} = 80\ sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.