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Mountain climbing and mathematics
To calculate the average, the total amount must be divided by the corresponding number of shares, not the sum of the two divided by 2.

Suppose this mountain road is 1 share.

The climbing time is 1÷3= 1/3 (hours).

Downhill time is 1÷5= 1/5 (hours).

The average speed is 2 ÷ (1/3+1/5) = 3.75 (km/h).

Answer: This is for climbers. The average downhill speed is 3.75 km/h.