Question

a train 150 metre long passes a tree in 12 seconds how long will it take to pass a tunnel 250 metre long
ans-32 sec​

Answer 1

Answer:

32 sec

Step-by-step explanation:

To pass through the tunnel, the train must travel a total of:

distance =

    length of tunnel (to get front of train from entrance to exit)

 + length of train (to then clear the train out the exit)

=  250 m + 150 m  = 400 m

As it travels 150 m in 12 sec, the time to travel 400 m is:

400 × 12 / 150 sec

= 40 × 12 / 15 sec

= 40 × 4 / 5 sec

= 8 × 4 sec

= 32 sec

Answer 2

150 meters in 12 seconds

50 meters in 4 seconds

150+250=400 meters

400 meters in 32 seconds

400÷50=8

8×4=32 seconds