Question

The bridge is500m long and 100m long train crosses the bridge at the speed of 30m per second find the time taken by the train to cross it

Answer 1

d = distance
s =speed

Answer 2

Total distance required for the train to cross the bridge is,

d = (500 + 100) m = 600 m

Hence the time taken to cross the bridge is,

t = 600 / 30 = 20 s.