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a train running at a speed of 72km/hr passes an electric pole in 12 second.how much time will it take to cross a tunnel 80m long
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11
Speed = 72 km/hr
= 72 * 5/18 m/s
= 20 m/s
The train passed its own distance when it passed the pole.
So distance covered by the train when it crossed the pole = 20 * 12 m = 240m
The train covered its own length + the length of the tunnel = 240 + 80 = 320 m
Time taken to cover 320m (when it crossed the tunnel) = 320/20 = 16 sec [Ans]
= 72 * 5/18 m/s
= 20 m/s
The train passed its own distance when it passed the pole.
So distance covered by the train when it crossed the pole = 20 * 12 m = 240m
The train covered its own length + the length of the tunnel = 240 + 80 = 320 m
Time taken to cover 320m (when it crossed the tunnel) = 320/20 = 16 sec [Ans]
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Answer:
I don't know
Step-by-step explanation:
I don't know
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