if a car travels 30km/hr at a uniform speed 40 km/hr and next 30 km/hr at uniform speed of 20 km /hr find average speed
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30/40+30/20=2.5 bcg first cover 30 I'm at the speed of 40 and other 30 at the speed of 20 so the result of average speed is 2.5 km/hr
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