The boat covered the distance between the marinas at a speed of 40 km / h in 2 hours, and the return

The boat covered the distance between the marinas at a speed of 40 km / h in 2 hours, and the return trip took 5 hours. At what speed did the boat go on the return trip?

To solve this problem, recall the formula for calculating the distance. Distance is equal to the product of time and speed. s = v * t, where s is distance, v is speed, t is time. Let’s calculate what the distance between the marinas is, knowing that the boat covered this route in 2 hours at a speed of 40 km / h.
s = v * t = 40 * 2 = 80 km.
Knowing that 5 hours were spent on the return journey, we calculate the speed of movement.
v = s / t = 80/5 = 16 km / h.
Answer: 16 km / h.