Question

A train 700 m long is running at the speed of 72 km\h. If it crosses a tunnel in 1 min then the the length of the tunnel is?

Answer 1

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.

Answer 2

Answer:

Answer is 500m

Step-by-step explanation:

$speed \: = \: 72 \times \frac{5}{?18} = 20m \\ let \: the \: length \: of \: tunnel \: be \: x \: m \\ then \: \frac{700 + x}{20} = 60 \\ = \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x = 500m$

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