A car travels 100km at a speed of 60km/hr and returns with a speed of 40km/h .calculate the average speed for the whole journey
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time for first journey=100/60=5/3 hr
time for second journey ie the return trip=100/40=5/2 hr
average speed=total distance/total time taken
=200/5/3+5/2
=48 km/hr (approx)
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