Question

A skateboarder went a kilometer in 3 minutes with the wind, and returned in four minutes against the wind.

How fast could he skateboard one kilometer if there was no wind?

Please explain your answer! Please! ​

Answer 1

Step-by-step answer:

Answer to problems of this kind is the reciprocal of the harmonic mean of the time required.

We need to find the average of the speeds, not the average of the time.

The respective speeds are 1/3 and 1/4.

The average of the speeds is therefore (1/3+1/4)/2 = 7/24 (harmonic mean of the time taken).

The time required is therefore the reciprocal of the unit speed,

T = 1/(7/24) = 24/7 = 3 3/7 minutes, or approximately 3.43 minutes.