# 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

January 15, 2021 | education

| **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.

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