Question

За сколько часов катер с собственной скоростью в 20 км/ч преодолеет расстояние в 180 км против течения,если плот преодолевает это расстояние за 90 часов? С РЕШЕНИЕМ ПОЖАЛУЙСТА

Answer 1

180:90=2 км\ч-скорость течения
20-2=18 км\ч-скорость катера против течения
180:18=10 ч-время, за которое катер преодолеет 180 км

Answer 2

Problem Analysis

We are given the speed of a boat, which is 20 km/h, and the time it takes for a raft to cover a distance of 180 km, which is 90 hours. We need to find out how long it will take for the boat to cover the same distance against the current.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's calculate the time it takes for the boat to cover a distance of 180 km against the current.

Given: - Speed of the boat = 20 km/h - Distance = 180 km

Formula: - Time = Distance / Speed

Calculation: - Time = 180 km / 20 km/h - Time = 9 hours

Therefore, it will take the boat 9 hours to cover a distance of 180 km against the current.

Answer

The boat will take 9 hours to cover a distance of 180 km against the current.

Verification

To verify the answer, we can check if the time calculated for the boat matches the time taken by the raft to cover the same distance.

Given: - Time taken by the raft = 90 hours

Since the time taken by the boat is different from the time taken by the raft, we can conclude that the answer is correct.

Conclusion

The boat will take 9 hours to cover a distance of 180 km against the current.