Question

A train 150 metre long passes a tree in 12 seconds. How long will it take to pass a tunnel 250 m long ?

Answer 1

A train 150m long passes a trees in 12second.
A train 1m long passes a trees in 12/150.=0.08s.
Then'time to passes the tunnel is 0.08×250.=20second .Answer .
Hope you help .......

Answer 2

Since the 150 metres long train takes 12 seconds for passing a tree
Therefore the time required for passing a train of 1m inside a tree = 12/150 = 0.08 seconds
Therefore the time required for passing a train of 250 m inside a tree = 0.08s × 250m = 20 seconds
The required time is 20 seconds