A 100 m long train is travelling at 54 km/hr. In what time will it pass a man riding a bike at 36 km/hr in the same direction?

18 seconds

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25 seconds

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20 seconds

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30 seconds

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Solution

The correct option is C
20 seconds

Given: Speed of the train = 54 km/hr
Speed of the bike = 36 km/hr

Relative speed = 54 - 36 = 18 km/hr [ $∵$ They move in same direction]

18 km/hr = $\frac{5}{18} \times 18$ = 5 m/s

Distance to be covered = 100 m (Length of the train)

$∴$ Time taken = $\frac{100}{5}$ = 20 seconds

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A 100 m long train is travelling at 54 km/hr. In what time will it pass a man riding a bike at 36 km/hr in the same direction?

The correct option is C 20 seconds Given: Speed of the train = 54 km/hr Speed of the bike = 36 km/hr Relative speed = 54 - 36 = 18 km/hr [∵ They move in same direction] 18 km/hr = 518×18 = 5 m/s Distance to be covered = 100 m (Length of the train) ∴ Time taken = 1005 = 20 seconds