Question

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

Answer 1

20 Seconds.
see-- when Train will cross bridge it will cross own length also... and it will yhen cross 500+100=600m in 30m/s. Then By Distance formula time= D/S ---- 600/30 = 20 Seconds ans.