Question

лодка двигалась по озеру 3,5 часов со скоростью 8,5 км /ч, потом вниз по реке 2,5ч .Какое расстояние она прошла, если ее собственная скорость не менялась , а скорость течения реки 1,3 км /ч

Answer 1

1)3,5*8,5=29,75(км)-путь лодки по озеру

2)8,5+1,3=9,8(км/ч)-скорость лодки по течению

3)2,5*9,8=24,5(км)-путь лодки по реке

4)29,75+24,5=54,25(км)-общий путь лодки

Answer 2

1) 3,5 * 8,5 = 29,75 (км) - прошла лодка в озере

2) 8,5 + 1,3 = 9,8 (км/ч) - скорость лодки вниз по реке

3) 9,8 * 2,5 = 24,5 (км) - прошла лодка в реке

4) 24,5 + 29,75 = 54,25 (км) - все расстояние

5) 54,25 км = 54 км 250 м

Ответ: лодка прошла 54 км 250 м.

Answer 3

Problem Analysis

We are given the following information: - The boat traveled on a lake for 3.5 hours at a speed of 8.5 km/h. - Then, the boat traveled downstream on a river for 2.5 hours. - The speed of the river's current is 1.3 km/h. - The boat's own speed did not change throughout the journey.

We need to calculate the total distance the boat traveled.

Calculation

To calculate the total distance traveled by the boat, we need to consider the distance traveled on the lake and the distance traveled downstream on the river.

# Distance on the Lake

The distance traveled on the lake can be calculated using the formula: Distance = Speed x Time

Given: - Speed on the lake = 8.5 km/h - Time on the lake = 3.5 hours

Using the formula, we can calculate the distance on the lake: Distance on the lake = 8.5 km/h x 3.5 hours

# Distance Downstream on the River

To calculate the distance downstream on the river, we need to consider the combined speed of the boat and the river's current. The boat's speed relative to the ground is the difference between its own speed and the speed of the river's current.

Given: - Speed of the boat = 8.5 km/h - Speed of the river's current = 1.3 km/h - Time downstream on the river = 2.5 hours

The speed of the boat relative to the ground is: Boat's speed relative to the ground = Speed of the boat - Speed of the river's current

Using the given values, we can calculate the boat's speed relative to the ground: Boat's speed relative to the ground = 8.5 km/h - 1.3 km/h

Now, we can calculate the distance downstream on the river using the formula: Distance downstream on the river = Boat's speed relative to the ground x Time downstream on the river

# Total Distance

To calculate the total distance traveled by the boat, we need to add the distance on the lake and the distance downstream on the river.

Total Distance = Distance on the lake + Distance downstream on the river

Calculation Steps

Let's calculate the total distance traveled by the boat step by step:

1. Calculate the distance on the lake: - Distance on the lake = 8.5 km/h x 3.5 hours

2. Calculate the boat's speed relative to the ground: - Boat's speed relative to the ground = 8.5 km/h - 1.3 km/h

3. Calculate the distance downstream on the river: - Distance downstream on the river = Boat's speed relative to the ground x 2.5 hours

4. Calculate the total distance: - Total Distance = Distance on the lake + Distance downstream on the river

Let's perform the calculations.