A delivery boy rides his bike at an average speed of $24$ miles per hour for delivering Pizza in the nearby locality. On the way , the bike gets stuck in traffic, which reduces his average speed for the return trip by $12.5$ percent. Find the bike average speed, in miles per hour, for the round trip.

22

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22.1

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22.4

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22.5

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Solution

The correct option is C $22.4$
Average speed for a round trip $=$ $\frac{2 s_{1} s_{2}}{s_{1} + s_{2}}$
$S_{1}$ $=$ average speed of one way
$S_{2}$ $=$ average speed of return trip
Return trip is reduced by $12.5 % = 21$
Therefore, average speed $=$ $\frac{2 \times 24 \times 21}{24 + 21} = 22.4$

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A delivery boy rides his bike at an average speed of 24 miles per hour for delivering Pizza in the nearby locality. On the way , the bike gets stuck in traffic, which reduces his average speed for the return trip by 12.5 percent. Find the bike average speed, in miles per hour, for the round trip.

The correct option is C 22.4Average speed for a round trip = 2s1s2s1+s2S1 = average speed of one wayS2 = average speed of return tripReturn trip is reduced by 12.5%=21Therefore, average speed = 2×24×2124+21=22.4

The correct option is C $22.4$
Average speed for a round trip $=$ $\frac{2 s_{1} s_{2}}{s_{1} + s_{2}}$
$S_{1}$ $=$ average speed of one way
$S_{2}$ $=$ average speed of return trip
Return trip is reduced by $12.5 % = 21$
Therefore, average speed $=$ $\frac{2 \times 24 \times 21}{24 + 21} = 22.4$