a train travels 20 km at a uniform speed of 60km/hr and the next 20 km at a uniform spped of 80 km/hr . Calculate its average speed
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Time taken to travel 20 km at 60km/hr, t1=20/60=0.33hr
time taken to travel nxt 20 km at 80km/hr, t2=20/80=0.25hr
total distance=40 km
total time=0.58 hr
avg speed=total distance travelled / total time taken=40/0.58=68.96km/hr.
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