The speed of the boat in still water is 25 km / h and the speed of the river flow is 5 km / h. How much time will the boat spend

The speed of the boat in still water is 25 km / h and the speed of the river flow is 5 km / h. How much time will the boat spend on moving from one pier to another and back if the distance between the marinas is 60 km.

1. Let’s determine how many kilometers a boat passes along the river in 1 hour.
25 + 5 = 30 kilometers.
2. Find out how long it will take it to swim 60 kilometers along the river.
60/30 = 2 hours.
3. Let’s calculate what distance the boat will pass against the river flow in 1 hour.
25 – 5 = 20 kilometers.
4. Let’s find the time that he will spend on the way back.
60/20 = 3 hours.
5. Find the time spent by the boat on the way back and forth.
2 + 3 = 5 hours.
Answer: The whole boat trip took 5 hours.