A car travels 100 km at a speed of 60 kmh and returns with a speed of 40kmh calculate the average speed for the whole journey
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Explanation:
time taken when going = 100/60 = 5/3 hrs
time taken when returning = 100/40 = 5/2 hrs
average speed for the whole journey
= (100+100)/(5/3 + 5/2)
=( 200 x 6 )/ (10+15)
= 1200/25
= 48 km/hr
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