The boat goes from one pier to another at a speed of 30 km / h, and returns back at a speed of 10 km / h more.

| May 21, 2021 | education

The boat goes from one pier to another at a speed of 30 km / h, and returns back at a speed of 10 km / h more. How long will the boat take all the way back and forth, if the distance between the marinas is 240 km / h.

Let’s solve this task by actions with explanations:
1) 240: 30 = 8 hours – during this time the boat will cover the distance between the marinas of 240 kilometers at a speed of 30 kilometers per hour;
2) 30 + 10 = 40 kilometers per hour – the speed of the boat on the way back, since it returns back at a speed of 10 kilometers per hour more;
3) 240: 40 = 6 hours – during this time the boat will cover the distance between the marinas of 240 kilometers at a speed of 40 kilometers per hour;
4) 8 + 6 = 14 hours – during this time the boat will go all the way.
Answer: in 14 hours.



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