A railway train 100 meters long is running at speed of 30 km/h in what time it pass a bridge 80 meters long?

Answer: 21.6 sec

To find the time taken, first, calculate the total distance the train needs to cover:

Total distance = Length of train + Length of bridge

= 100 m + 80 m

= 180 m

Convert the speed from km/h to m/s:

30 km/h = 30 × (1000 m / 3600 s)

= 30 × 5/18

= 8.33 m/s

Time taken = Distance / Speed

= 180 m / 8.33 m/s

= 21.6 seconds

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