The boat in the first hour sailed at a speed of 18 / km per hour, in the second hour it reduced the speed by 15%
| May 7, 2021 | education
The boat in the first hour sailed at a speed of 18 / km per hour, in the second hour it reduced the speed by 15%. And in the third, the last speed increased by 20%. At what speed the boat sailed in the third hour.
Let us determine the speed with which the indicated boat sailed for the second hour of the journey, knowing by the condition of the problem that it is 15% lower than its initial speed:
18 – 18 * 15/100 = 15.3.
Let us determine the speed with which the indicated boat sailed for the third hour of the journey, knowing by the condition of the problem that it is 20% higher than its speed in the second hour of the journey:
15.3 + 15.3 * 20/100 = 18.36.
Answer: The speed of the boat during the third hour of sailing was 18.36 km / h.
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