Question

train travels 20 km at a uniform speed of 60 km h-1 and the next 20 km at a uniform speed of 80 km
Calculate its average speed.

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Answer 1

ANSWER

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

time taken=40/0.58=68.96km/hr                                                                                                ≈69km/hr (answer)