A train crosses a platform in 30 seconds at a speed of 45km/hr. How much time will it take to cross an electric pole if take to cross an electric pole if the length of the platform is 100 metres?

8 seconds
30 seconds
52 seconds
None of these

Correct Answer: 30 seconds

Explanation:

Distance covered by the train in crossing the platform
= (45 x 30) / 3600
= 3/8 km
= 375 metres
∴ Length of train = (375 - 100) = 275 meters
∴ Time taken to cross the pole
= 275 ÷ (375/30)
= (275 x 30) /375
= 30 sec

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