Question

a train 100metres long completely crosses a bridge 300m long in 30sec.How many seconds will it take to pass a telegraph pole

Answer 1

Answer:

7.5 sec

Step-by-step explanation:

total length the train covers is 100+300=400 meters in 30 sec thus the speed of the train is 400/30 m/s

now it has to cover its own length when it crosses the pole hence

100/(400/30) =7.5 sec