The motorcyclist traveled 90 km in the first 2 hours, and in the next 3 hours moved at a speed of 50 km / h. Find the average speed.

Given:
v1 = 90 km / h – speed in the first segment of time;
t1 = 2 hours – the first period of time;
v2 = 50 km / h – speed in the second time interval;
t2 = 3 hours – the second period of time.
It is required to find Vav – the average speed along the entire path.
Vcr = S / t = (v1 * t1 + v2 * t2) / (t1 + t2) = (90 * 2 + 50 * 3) / (2 + 3) = (180 + 150) / 5 = 330/5 = 66 km / h.
Answer: the average speed is 66 km / h.