Question

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
meters is
(A) 56 sec
(B) 68 sec
(C) 80 sec
(D) 92 sec​

Answer 1

Answer: C) 80 s

Explanation:

45kmph=12.5m/s

total length discovered by train=850m+150m=1000m

velocity=Dispacement/time

t=s/v

t=1000m / (12.5m/s)

t=80s

time taken to cross the bridge is 80s

I hope u understand...