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A train, 200 m long, is running at a speed of 45 km/hr. The time taken by the train to cross a 100 m long tunnel is
Question

A train, 200 m long, is running at a speed of 45 km/hr. The time taken by the train to cross a 100 m long tunnel is

A.

22 Seconds

B.

20 Seconds

C.

24 Seconds

D.

28 Seconds

Correct option is C

Given
Train Length = 200 m
Tunnel Length = 100 m
Speed = 45 km/h

Formula Used
Time = Total DistanceSpeed\frac{\text{Total Distance}}{\text{Speed}}​​
Conversion: 1 km/h = 518m/s\frac{5}{18} m/s​​

Solution
Total Distance = 200 + 100 = 300 m
Speed in m/s = 45×518=22518=12.5m/s45 \times \frac{5}{18} = \frac{225}{18} = 12.5 m/s​​
Time = 30012.5=24seconds\frac{300}{12.5} = 24 seconds​​

Final Answer
So the correct answer is (c)

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