Question

a bridge is 500m long.a 100m long train crosses the bridge at a speed of 30 m/s. find the time taken by train to cross it

Answer 1

we have , Length of Bridge (Distance of bridge)= 500m & Speed of Train = 30m/s

therefore, Time taken = Distance/Speed
= 500m/30s
= 16.67 sec (Time taken)

Answer 2

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

d = (100 + 500) m = 600 m

Hence the time taken to cross the bridge is,

t = 600 / 30 = 20 s.