The boat’s own speed is 15 as much as 1/2 km / h. The speed of the river is 2 as much as 1/4 km / h.
| April 14, 2021 | education
The boat’s own speed is 15 as much as 1/2 km / h. The speed of the river is 2 as much as 1/4 km / h. How long does it take for a boat to sail a distance of 71 km if it goes with the flow? How long does it take for a boat to sail a distance of 79 1/2 km if it goes against the current?
The speed of the boat downstream will be equal to:
15 1/2 + 2 1/4 = 15.5 + 2.25 = 17.75 km / h,
and the speed against the current:
15 1/2 -2 1/4 = 15.5-2.25 = 13.25 km / h.
Then, the time of movement against the current will be equal to:
79 1/2: 13.25 = 79.5: 13.25 = 6 hours.
Time downstream:
71: 13.25 = 5.4 hours.
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