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A and B are two cities.A man travels from A to B at a speed of 10 km/hr and returns back at the speed of 30 km/hr.Find his average speed for whole journey. ?->(Show Answer!)
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1. A and B are two cities.A man travels from A to B at a speed of 10 km/hr and returns back at the speed of 30 km/hr.Find his average speed for whole journey.





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