The cyclist covered 1.8 km in 2 minutes, then 200 m in 20 seconds. What is the average speed of movement?

S1 = 1.8 km = 1800 m.

t1 = 2 min = 120 s.

S2 = 200 m.

t2 = 20 s.

Vav -?

To find the average speed of movement Vav, it is necessary to divide the entire distance traveled by the train S by the time of its movement t along the entire path: Vav = S / t.

The travel time of the entire path is expressed by the sum: t = t1 + t2, where t1 is the time of movement on the first part of the path, t2 is the time of movement on the part of the path.

S = S1 + S2.

Vav = (S1 + S2) / (t1 + t2).

Vav = (1800 m + 200 m) / (120 s + 20 s) = 10 m / s.

Answer: the average speed of a cyclist was Vav = 10 m / s.