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A delivery boy rides his bike at an average speed of 24 miles per hour for delivering Pizza in a 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 average speed, in miles per hour, for the round trip.

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22.1

22.4

22.6

answer is C.

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Detailed Solution

Concept- Assume that the messenger travels on one side as D. Then calculate the time

Here

It's time for a trip and

It's time for the return trip. Then edit the velocity (return) and calculate the average velocity.
Let

be the one way average speed and

be the return trip average speed.
Speed = Total distance/Total time
Question Image

Average speed is calculated by Question Image

Given that, bike reduces his average speed for the return trip by 12.5 percent
Thus, the average speed will be

Hence, the correct answer is option (3)

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