Question

катер прошёл по течению реки 87,5км за5часов апротив теченияэто же расстояние он прошёл за7 часов.Чему равна собственная скорость катера и скорость течения реки?

Answer 1

1)87,5:5=17,5 км/ч скорость по течению

2)87,5:7=12,5 км/ч скорость против течения

3)(17,5-12,5):2=2,5км/ч скорость течения

4)12,5+2,5=15 км/ч скорость катера

От вет: 15км/ч и 2,5км/ч

 

 

Answer 2

Calculation of the Boat's Speed and River Current

To determine the boat's speed and the speed of the river current, we can use the information provided. Let's break down the problem step by step.

1. The boat traveled a distance of 87.5 km in 5 hours when going against the current. 2. The boat also traveled the same distance of 87.5 km in 7 hours when going with the current.

Calculating the Boat's Speed

To find the boat's speed, we can use the formula:

Speed = Distance / Time

Using the information provided, we can calculate the boat's speed when going against the current:

Boat's Speed (against the current) = 87.5 km / 5 hours

Calculating this, we find that the boat's speed when going against the current is 17.5 km/h.

Similarly, we can calculate the boat's speed when going with the current:

Boat's Speed (with the current) = 87.5 km / 7 hours

Calculating this, we find that the boat's speed when going with the current is 12.5 km/h.

Calculating the River Current's Speed

To find the speed of the river current, we can subtract the boat's speed when going with the current from the boat's speed when going against the current:

River Current's Speed = Boat's Speed (against the current) - Boat's Speed (with the current)

Using the values we calculated earlier, we can find the speed of the river current:

River Current's Speed = 17.5 km/h - 12.5 km/h

Calculating this, we find that the speed of the river current is 5 km/h.

Conclusion

Based on the given information, the boat's speed is 17.5 km/h and the speed of the river current is 5 km/h.

Please note that these calculations are based on the information provided and may not account for other factors that could affect the boat's speed and the river current.