What time (in seconds) is required for a 284 m long train to cross a 676 m long tunnel, if the train travels at a speed of 18 km/h?

Correct option is C

Given:

Length of train = 284 m, Length of tunnel = 676 m, Speed of train = 18 km/h
Formula Used:

Time =$$\frac{\text{Distance}}{\text{Speed}}$$​​
Solution:
Speed =$$18 {\text{km/h}} \times \frac{1000 \, \text{m}}{1 \, \text{km}} \times \frac{1 \, \text{h}}{3600 \, \text{s}} = 5 \text{m/s}$$​​
Total distance = Length of train + Length of tunnel = 284 m + 676 m = 960 m
Calculate the time required to cross the tunnel:
Time = $$\frac{\text{Distance}}{\text{Speed}}$$​ =$$\frac{960 m }{ 5 m/s } = 192 sec$$​