Question

a 200 metre long train crosses A 400 metre long Bridgewith a speed of 36km h-1 calculate the time taken by the train cross the birdge

Answer 1

speed of the train = 36*5/18 = 10m/s.
total distance covered by the train = 200 + 400 = 600m
speed = distance/time
time = distance/speed
time = 600/10 = 60s.