A object drives from a to b with uniform speed of 30 km/h and back to a with a speed of 20km/h .find its average speed
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Answer:
24km/hr
Explanation:
Let d be the distance between a and b
Total displacement/total time
= 2 d/ [(d/30) + (d/20)]
=2d*60/5d
= 120/5
=24
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