Question

12. A 75 m long train crosses a bridge of length
300 m in 15 seconds. What is the speed of the train
in km/h?​

Answer 1

Step-by-step explanation:

75 m long train crosses a bridge of length 300 m in 15 seconds. What is the speed of the train in km/h?

We know Speed = distance / time

The train covers the bridge length as well as it's own.kength to cross the bridge therefore distance is 300 m + 75 m = 375 m

Distance = 375 m = 0.375 km

Time = 15 seconds = 15/3600 hour

Speed = 0.375/ 15/3600 km/h

Speed = 0.375 × 3600/15 km/h

Speed = 1350/15 km/h

Speed = 90 km per hour

Answer the train speed is 90 km per hour

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