The boat sailed 148.5 km between two piers along the river in 9 hours, and against the current in 11
| July 3, 2021 | education
The boat sailed 148.5 km between two piers along the river in 9 hours, and against the current in 11 hours. Find the speed of the river.
1) Find the speed of the boat along the river.
To do this, divide the distance between the piers by the travel time.
Will be:
148.5 / 9 = 16.5 km / h.
2) Find the speed of the boat when moving against the current.
148.5 / 11 = 13.5 km / h.
3) Find the difference between the speed of the boat downstream and against it.
To do this, we subtract the speed upstream of the river from the speed along the river.
Will be:
16.5 – 13.5 = 3 km / h.
4) Determine the speed of the current.
To do this, we divide the difference in speed into 2 directions.
3/2 = 1.5 km / h.
Answer: 1.5 km / h.
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