Question

a train 150m long passes a tree in 12 second. how long will it take to pass a tunnel 250m long

Answer 1

It will it take 20 seconds to pass a tunnel 250m long.
Explanation:
The train 150m long passes a tree in 12 second.
It will travel in 1 second: 150m/12 =12.5 m
To pass 250 m tunnel, it will take: 250m/12.5m= 20 seconds

Answer 2

Thank you it may help you