a car travels with speed of 40km/hr for 3hrs.At what speed must it travel for next 2hrs so that the average speed will 48km/hr for 5hrs
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distance traveled by that car in 3 hr=3×40=120
total distance in 5 hr =48×5=250
rest distance =240-120=120
rest time =2hr
required speed =rest distance ÷rest time
=120÷2=60km/HR
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