a car travels P to Q at a uniform speed of 20m/s and immediately turns back and travels towards Q with a uniform speed of 30m/s. What is the average speed for the whole journey?
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can u tell if the time is given of not
kristigupta:
the time is not given
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When it was at Q it turns back and travels to “P”
Average speed = 2v1v2 / (v1 + v2) = 2*20*30 / (20 + 30) = 1200 / 50 = 24m/s
Average speed = 2v1v2 / (v1 + v2) = 2*20*30 / (20 + 30) = 1200 / 50 = 24m/s
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