A train 700 m long is running at 72 km/h. If it crosses a tunnel in one minute, then the length of the tunnel is

Correct option is C

Given:

Length of train = 700 m

Speed of train = 72 km/h

Time to cross the tunnel = 1 minute = 60 seconds

Formula Used:

Distance = $$\text{Speed} \times \text{Time}$$​​

Solution:​

Speed (m/s) = $$\frac{72 \times 1000}{3600} = 20 \, \text{m/s}$$​​

Total distance covered in 60 seconds:

Distance = $$20 \times 60 = 1200 \, \text{m}$$​​​

Length of tunnel = 1200 - 700 = 500 m