Question

A train travels 20 km at a uniform speed of 60 km per hour and the next 20 km at a uniform speed of 80 kilometres per hour calculate its average speed​

Answer 1

Answer:

Explanation:

time taken to travel 20 km at 60km/hr=20/60=0.33hr

time taken to travel nxt 20 km at 80km/hr=20/80=0.25hr

avg speed=total distance travelled / total time taken=40/0.58=68.96km/hr

                                                                                               ≈69km/hr

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Answer 2

Explanation:

Average speed = Total speed / Total time Average speed = 60+80/2 = 140/2 = 70

Average speed is 70km/h