The boat travels a certain distance along the lake in 6 hours, and along the river the same distance
| June 2, 2021 | education
The boat travels a certain distance along the lake in 6 hours, and along the river the same distance – in 5 hours. In how many hours will the raft sail along the river?
We take the entire distance as 1
1/6 – speed along the lake, 1/5 – speed downstream.
1 / 5-1 / 6 = (6-5) / 30 = 1/30 – current speed
1: 1/30 = 30 hours a raft will need
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