Question

Собственная скорость катера 18 целых 4/5 км/ч,а скорость течения реки 2целых 1/2 км/ч.Найдите скорость катера по течению и против течения?Помогите пожалуйста решить!(есть целые части!!!)Спасибо заранее!прошу(мне скоро уже идти в школу,а я ни как не сделала

Answer 1

1) 18 4/5 + 2 1/2 = 21 3/10  =21,3 км/час - скорость по течению

2)  18 4/5 - 2 1/2 = 16 3/10 = 16,3 км/час - скорость против течения

Answer 2

Calculation of Boat's Speed with and against the Current

To find the boat's speed with and against the current, we need to consider the given information:

- Boat's speed: 18 4/5 km/h - River's current speed: 2 1/2 km/h

Let's calculate the boat's speed with the current first:

To find the boat's speed with the current, we add the boat's speed and the current speed:

Boat's speed with the current = Boat's speed + Current speed

Boat's speed with the current = 18 4/5 km/h + 2 1/2 km/h

To add these fractions, we need to find a common denominator. The common denominator for 5 and 2 is 10.

Boat's speed with the current = (18 * 10/5) + (2 * 10/2) km/h

Boat's speed with the current = (180/5) + (20/2) km/h

Boat's speed with the current = 36 + 10 km/h

Boat's speed with the current = 46 km/h .

Now, let's calculate the boat's speed against the current:

To find the boat's speed against the current, we subtract the current speed from the boat's speed:

Boat's speed against the current = Boat's speed - Current speed

Boat's speed against the current = 18 4/5 km/h - 2 1/2 km/h

To subtract these fractions, we need to find a common denominator. The common denominator for 5 and 2 is 10.

Boat's speed against the current = (18 * 10/5) - (2 * 10/2) km/h

Boat's speed against the current = (180/5) - (20/2) km/h

Boat's speed against the current = 36 - 10 km/h

Boat's speed against the current = 26 km/h .

Therefore, the boat's speed with the current is 46 km/h, and the boat's speed against the current is 26 km/h.

I hope this helps! Let me know if you have any further questions.