The boat covered the distance between the two marinas in 3 hours, going at a speed of 20 km / h.
| September 9, 2021 | education
The boat covered the distance between the two marinas in 3 hours, going at a speed of 20 km / h. On the way back, he reduced the speed by 5 km / h. How long did it take for the boat to make its way back?
To find out how much the boat sailed between the first and second pier the first time, you need to multiply the speed by the time.
3 * 20 = 60 (km) distance between the first and second pier.
The second time the boat sailed at a speed of 5 km / h less, so.
20 – 5 = 15 (km / h) speed of the boat for the second time.
Now, to find out how many hours the boat sailed the second time, you need to divide the distance by the speed.
60/15 = 4 (hours) during this time the boat sailed for the second time.
Answer: The boat made its way back in 4 hours.
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