Question

A 725 m long train passes through a 235 m long tunnel in 48 sec. Find the speed of the train.

• A. 66 km/h
• B. 54 km/h
• C. 72 km/h
• D. 82 km/h

Answer 1

Answer:

C. 72 km/h

To pass completely through the tunnel, the train covers:

Total distance = length of train + length of tunnel
$= 725 + 235 = 960 \text{ m}$

Time = 48 seconds

Speed of the train:

$\text{Speed} = \frac{960}{48} = 20 \text{ m/s}$

Convert to km/h:
$20 \times \frac{18}{5} = 72 \text{ km/h}$
Speed of the train = 72 km/h