Question

1) Скорость катера в стоячей воде 16,7 км/ч,а скорость течения реки 2,3 км/ч.Катер шел 2 часа по течению реки,а затем повернул назад и шел еще 3 часа. Сколько километров прошел катер? СРОЧНО ПОМОГИТЕ!!!

Answer 1

16,7 км/ч - собственная скорость катера
16,7 + 2,3 = 19 км/ч - скорость катера по течению реки
16,7 - 2,3 = 14,4 км/ч - скорость катера против течения реки
2 ч по течению и 3 ч против течения - время в пути
s = v * t - формула пути
---------------------------------------
s = 19 * 2 + 14,4 * 3 = 38 + 43,2 = 81,2 км - путь катера за 5 часов
Выражение: (16,7 + 2,3) * 2 + (16,7 - 2,3) * 3 = 81,2
Ответ: 81,2 км.

Answer 2

16,7+2,3=19,0
16,7-2,3=14,4
19,0*2+14,4*3=...
* - умножение

Answer 3

Problem Analysis

To solve this problem, we need to calculate the distance traveled by the boat. We are given the speed of the boat in still water (16.7 km/h) and the speed of the river current (2.3 km/h). The boat travels downstream for 2 hours and then returns upstream for 3 hours. We need to find the total distance traveled by the boat.

Calculation

To calculate the distance traveled by the boat, we can use the formula:

Distance = Speed x Time

Let's calculate the distance traveled downstream and upstream separately.

Downstream Distance

The boat is traveling downstream, which means it is moving in the same direction as the river current. The effective speed of the boat is the sum of the boat's speed in still water and the speed of the river current.

Effective Speed Downstream = Boat Speed + River Current Speed

Effective Speed Downstream = 16.7 km/h + 2.3 km/h = 19 km/h

The boat travels downstream for 2 hours, so the distance traveled downstream is:

Downstream Distance = Effective Speed Downstream x Time

Downstream Distance = 19 km/h x 2 hours = 38 km

Upstream Distance

The boat is traveling upstream, which means it is moving against the river current. The effective speed of the boat is the difference between the boat's speed in still water and the speed of the river current.

Effective Speed Upstream = Boat Speed - River Current Speed

Effective Speed Upstream = 16.7 km/h - 2.3 km/h = 14.4 km/h

The boat travels upstream for 3 hours, so the distance traveled upstream is:

Upstream Distance = Effective Speed Upstream x Time

Upstream Distance = 14.4 km/h x 3 hours = 43.2 km

Total Distance Traveled

The total distance traveled by the boat is the sum of the downstream distance and the upstream distance.

Total Distance Traveled = Downstream Distance + Upstream Distance

Total Distance Traveled = 38 km + 43.2 km = 81.2 km

Therefore, the boat traveled a total distance of 81.2 kilometers.

Answer

The boat traveled a total distance of 81.2 kilometers.

Note: The search results did not provide direct snippets for the calculations. However, the calculations are based on the basic formula for distance, speed, and time.