The boat’s own speed is 16.35 km / h, the speed of the river is 2.9 km / h. the boat sailed with the current for 2 hours

| January 1, 2021 | education

The boat’s own speed is 16.35 km / h, the speed of the river is 2.9 km / h. the boat sailed with the current for 2 hours, against the current-sch, how many kilometers the boat sailed in 5 hours.

First, we need to find the speed of the boat upstream and downstream. In order to find the speed along the current, we take and add to the speed of the boat, the speed of the current. And in order to find out the speed against the current, we take and subtract from the speed of the boat, the speed of the current:
16.35 + 2.9 = 19.25 km / h downstream speed.
16.35 – 2.9 = 13.45 km / h speed upstream.
Now we take and multiply the speed by time, so we find the distance traveled:
19.25 * 2 = 38.5 kilometers, the boat sailed downstream.
13.45 * 3 = 40.35 kilometers, the boat sailed against the current.
Now we are looking for the sum of these values ​​and find out how much the boat sailed in 5 hours:
40.35 + 38.5 = 78.85 kilometers, the boat sailed in 5 hours.
Answer: 78.85 kilometers.



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