When someone is riding a bicycle, the average speed on the uphill is 3m / s, and the average speed on the downhill is 5m / s

When someone is riding a bicycle, the average speed on the uphill is 3m / s, and the average speed on the downhill is 5m / s

Suppose the slope length is s, then the uphill time T1 = s / V1 = s / 3 and the downhill time T2 = s / V2 = s / 5
Ttotal = T1 + T2 = s / 3 + S / 5
Average velocity v = s total / T total = 2S / (s / 3 + S / 5) = 3.75m/s