A man travels with a speed 30 kmph for first half of the journey time and with a speed of 70 kmph for the next half of the journey time. Find the average speed of the man is
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The first half of the distance takes d km/30 kmph = d/30 hr. The second half of the distance takes d km/50 kmph = d/50 hr. So the total time taken to cover 2d km = (d/30)+(d/50) = 80d/150 hr. = 37.5 kmph
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Step-by-step explanation:
The first half of the distance takes d km/30 kmph = d/30 hr.
The second half of the distance takes d km/50 kmph = d/50 hr.
So the total time taken to cover
2d km = (d/30)+(d/50)
= 80d/150 hr.
= 37.5 kmph.
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