Question

A train $225$ m long ,travelling at a uniform speed of $54$ km/hr. How much time will it take to pass a bridge $105$ m long ?

• A. $22$ sec
• B. $32$ sec
• C. $20$ sec
• D. $15$ sec

Answer 1

The correct option is A $22$ sec

$54km/hr=54\times \frac{5}{18}m/sec=15$ m/sec

Total distance covered by train in passing the bridge $=$ Length of the train $+$ Length of the bridge

$Time=\frac{TotalDistanceTravelled}{Speed}=\frac{225+105}{15}=22$ seconds