Question

A 700 metre train passes an electric pole in 40 seconds. Calculate speed of the train?

Answer 1

Answer:

700/50

speed =distance / time

Answer 2

Answer:

It's simple as it look as you apply physics laws and think logically:

Length of train = 700 m

Length of tunnel = X (let)

Time taken to cross the tunnel = 1 minute = 60 sec.

Speed = 72 kmph = (72*5)/18 = 20 m sec

To cross the tunnel train needs to travel = Length of train + length of tunnel = 700 +X

Now,

S*T = D

20 *60 = 700 +X

X = 1200 - 700 = 500

Length of tunnel = 500 m