There are two cyclists traveling along the same path.

One of them lets say cyclist

A has a speed of

20 miles per hr and starts traveling at

12 PMAnother cyclist let us say

B has a speed that we do not know and that is what is required by the question.

Cyclist

B starts traveling along the same path as

A but

2 hrs later than

A i.e. at

2PM

Also at

4PM both cyclists travel the same distance from the starting point P.

Let us find out how much can cyclist

A travel in

4 hrs, that would be \(20*4 = 80\) miles

Since cyclist

B started at

2PM and reached the exact distance as cyclist A at

4PM. Cyclist

B traveled for

2 hrs only.

Therefore if Cyclist B speed was

x miles per hr then

2x = 80or, \(x = 40\) which is the speed of cyclist B

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This is my response to the question and may be incorrect. Feel free to rectify any mistakes