A 240 m long train crosses a 360 m long tunnel in 30 seconds. What is the speed of the train (in km/h)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 72
Given:
Length of train = 240 m
Length of tunnel = 360
Time = 30 seconds
Concept Used:
Time = Distance/Speed ...(i)
Explanation:
Let the speed of the train be s km/hr
Now,
(240 + 360)/s = 30
⇒ 600/s = 30
⇒ s = 20
So, the speed of the train is 20 m/sec
Speed in km/hr = 20 × (18/5) = 72 km/hr.
Hence the speed of the train is 72 km/hr.