The cyclist rides on the highway at a speed of 15 km / h. Can he drive 80 km along a country road in 4 hours?

The cyclist rides on the highway at a speed of 15 km / h. Can he drive 80 km along a country road in 4 hours? Can a cyclist cover 5 km in 15 minutes? Under what conditions?

1. We calculate how many km a cyclist will travel along a country road at a speed of 15 km / h:
15 x 4 = 60 km.
2. To drive 80 km along a country lane in 4 hours, the speed must be:
80: 4 = 20 km / h.
3.15 minutes = 15/60 hours = 1/4 hour = 0.25 hours.
4. We calculate the speed at which a cyclist must travel in order to travel 5 km in
0.25 hours:
5: 0.25 = 20 km / h.
Answer: a cyclist can cover 80 km in 4 hours if he increases his speed to 20 km / h, he can cover 5 km in 15 minutes if his speed is 20 km / h.