A man is standing on a railway bridge which is 180 m long.

A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 10 seconds. Find the length of the train and its speed.

Quiz

Answer/Solution

10 m/sec

Steps/Work

If length of train is l and speed of train is s, then
l/s = 10
(l+180)/s = 20
(l+180)/l = 20/10 =2
l+180 =2l
l= 180
l=180 mtrs
s= l/10 = 180/8 = 10 m/sec
ANSWER:A