Question

ООООООчень надо!!!! 1) Собственная скорость катера 27 км/ч,скорость течения 3 км/ч.Сколько времени теплоход затратит на путь против течения между двумя причалами,если расстояние между ними 150км/ч. 2) За 2,5 кг конфет бало заплачено 5,5 д.е.Сколько денег надо заплатить , чтобы купить 2,9 кг таких конфет?

Answer 1

1) скорость против течения
27-3=24 км/ч
Время в пути
150:24=6и1/4 ч
2) 5,5:2,5=2,2 Д.е. За кг
2,2*2,9=6,38 д.е.

Answer 2

27-3=24 км/ч
150/24=6,25

Answer 3

Calculating Boat Travel Time Against the Current

To calculate the time it takes for the boat to travel against the current, we can use the formula:

Time = Distance / (Boat Speed - Current Speed)

Given: - Boat speed = 27 km/h - Current speed = 3 km/h - Distance = 150 km

Substitute the given values into the formula:

Time = 150 km / (27 km/h - 3 km/h)

Time = 150 km / 24 km/h

Time = 6.25 hours

So, the boat will take approximately 6.25 hours to travel against the current between the two docks.

Calculating Cost of Candy Purchase

To calculate the cost of purchasing 2.9 kg of candy at the same rate as 2.5 kg, we can use the following proportion:

Cost1 / Weight1 = Cost2 / Weight2

Given: - Cost1 = 5.5 d.e. (for 2.5 kg) - Weight1 = 2.5 kg - Weight2 = 2.9 kg

Substitute the given values into the proportion:

5.5 / 2.5 = Cost2 / 2.9

Cross-multiply to solve for Cost2:

5.5 * 2.9 = 2.5 * Cost2

Cost2 = (5.5 * 2.9) / 2.5

Cost2 ≈ 6.37 d.e.

So, approximately 6.37 d.e. is needed to buy 2.9 kg of the same candy.

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