A train 700 m long is running at the speed of 72 km/hr. If it cross a tunnel in 1 minute, then the length of the tunnel?

700 m
600 m
550 m
500 m

Correct Answer: 500 m

Explanation:

length of tunnel + length of train = distances covered by train in 1 min
⇒ length of tunnel + 700 = 72/60 km = 1.2 km = 1200 m
∴ length of tunnel = 1200 - 700 = 500 m

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