Question

Заранее спасибо!1.Собственная скорость теплохода 35,3 км/ч,а скорость течения реки 2,8 км/ч. С какой скоростью будет двигаться теплоход:а)по течению реки, б)против течения реки?2.Собственная скорость катера равна 15,4 км/ч,а его скорость против течения реки 12,1 км/ч. С какой скоростью течёт река? Какова скорость катера по течению реки? Какое расстояние проплывёт катер,если будет двигаться 1,4 ч по течению реки?3.Собственная скорость яхты 31,3 км/ч,а её скорость по течению реки 34,2 км/ч.Какое расстояние проплывёт яхта,если будет двигаться 3 ч против реки?

Answer 1

15.4-12.1=3.3   3.3 скорость течения реки    15.4+3.3=18.7 скорость по течению    18.7*1.4=26.18       ответ 26.8 км                                                                             34.2-31.3=2.9      2.9 скорость течения реки    31.3-2.9=28.4     85.2 скорость против течения     28.4*3=85.5    ответ 85.2км

Answer 2

Question 1:

The speed of the boat relative to the river can be calculated by subtracting the speed of the river from the speed of the boat.

a) To calculate the speed of the boat with the current, we subtract the speed of the river from the speed of the boat: - Boat speed with the current = Boat speed - River speed - Boat speed with the current = 35.3 km/h - 2.8 km/h - Boat speed with the current = 32.5 km/h.

b) To calculate the speed of the boat against the current, we add the speed of the river to the speed of the boat: - Boat speed against the current = Boat speed + River speed - Boat speed against the current = 35.3 km/h + 2.8 km/h - Boat speed against the current = 38.1 km/h.

Question 2:

To calculate the speed of the river, we subtract the speed of the boat against the current from the boat's own speed:

- River speed = Boat speed - Boat speed against the current - River speed = 15.4 km/h - 12.1 km/h - River speed = 3.3 km/h.

To calculate the boat's speed with the current, we add the speed of the river to the boat's own speed:

- Boat speed with the current = Boat speed + River speed - Boat speed with the current = 15.4 km/h + 3.3 km/h - Boat speed with the current = 18.7 km/h.

To calculate the distance the boat will travel if it moves with the current for 1.4 hours, we multiply the boat's speed with the current by the time:

- Distance = Boat speed with the current * Time - Distance = 18.7 km/h * 1.4 h - Distance = 26.18 km.

Question 3:

To calculate the distance the yacht will travel if it moves against the river for 3 hours, we multiply the yacht's speed against the current by the time:

- Distance = Yacht speed against the current * Time - Distance = 31.3 km/h * 3 h - Distance = 93.9 km.