The convoy of cars moves along the highway at a speed of 10 m / s, stretching at a distance of 2 km. A motorcyclist leaves

The convoy of cars moves along the highway at a speed of 10 m / s, stretching at a distance of 2 km. A motorcyclist leaves the tail of the column at a speed of 20 m / s and moves towards the head of the column. How long does it take to reach the head of the column?

Given:
S = 2 km
v1 = 10 m / s
v2 = 20 m / s
Find t motorcyclist
Decision:
2 km = 2000 m
To find the time, you need t = S / v2-v1
t = 2000 m / 20 m / s-10 m / s
t = 200 s.
Answer: in 200 seconds; A.