A car travels along a straight line for first half time with speed 40km/hr and the second half time with speed 20km/hr .find the average speed of car.
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Let the car travel for 1hr in Given speed each ,so in 1st hr it travels 40km
in 2nd hr it travels 20km
total distance=40+20=60km
& total time=2hr,
so avg speed=60/2=30kmph
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