A man goes up a hill at 18 kmph and comes down at 24 kmph along the same path. What is his average speed?A)20.57km/hrB)26km/hrC)15km/hrD)None of these.
Question
A man goes up a hill at 18 kmph and comes down at 24 kmph along the same path. What is his average speed?A)20.57km/hrB)26km/hrC)15km/hrD)None of these.
Solution
The average speed is calculated by using the formula 2xy/(x+y), where x and y are the two speeds.
Here, x = 18 kmph (speed while going up) and y = 24 kmph (speed while coming down).
So, the average speed = 21824 / (18+24) = 864 / 42 = 20.57 kmph.
So, the answer is A) 20.57 kmph.
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