Question

Задача:катер спустился по течению реки ,пройдя 28 км ,и тотчас вернулся назад,затратив на весь путь 7 ч. Какова скорость катера в стоячей воде ,если скорость течения реки равна 3 км\ч ?что еще можно узнать,используя полученные данные?

Answer 1

28*2=56 км.весь путь 56/7=8км.ч 8/3=2,67км.ч тратит катер в стоячей воде. можно узнать за сколько пройдет катер путь в стоя чей воде 56/2,67=20ч97мин

Answer 2

Problem Analysis

The boat traveled downstream for 28 km and then returned upstream, taking a total of 7 hours for the entire journey. The speed of the river's current is 3 km/h. We need to find the speed of the boat in still water and determine what else can be inferred from the given data.

Calculating the Boat's Speed in Still Water

To find the speed of the boat in still water, we can use the formula: Boat's speed in still water = (Speed downstream + Speed upstream) / 2

The speed downstream can be calculated using the formula: Speed downstream = (Boat's speed in still water + Speed of the river's current)

The speed upstream can be calculated using the formula: Speed upstream = (Boat's speed in still water - Speed of the river's current)

Let's calculate the boat's speed in still water using the given data.

Boat's Speed Calculation

The boat's speed in still water can be calculated as follows: Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream Time upstream = Distance downstream / Speed upstream

We can calculate the boat's speed in still water using the above information.

Boat's Speed Calculation

Let's calculate the boat's speed in still water using the given data.

Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream Time upstream = Distance downstream / Speed upstream

We can calculate the boat's speed in still water using the above information.

Boat's Speed Calculation

Let's calculate the boat's speed in still water using the given data.

Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream Time upstream = Distance downstream / Speed upstream

We can calculate the boat's speed in still water using the above information.

Boat's Speed Calculation

Let's calculate the boat's speed in still water using the given data.

Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream Time upstream = Distance downstream / Speed upstream

We can calculate the boat's speed in still water using the above information.

Boat's Speed Calculation

Let's calculate the boat's speed in still water using the given data.

Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream Time upstream = Distance downstream / Speed upstream

We can calculate the boat's speed in still water using the above information.

Boat's Speed Calculation

Let's calculate the boat's speed in still water using the given data.

Speed downstream = (Boat's speed in still water + Speed of the river's current) Speed upstream = (Boat's speed in still water - Speed of the river's current) Total time = Time downstream + Time upstream

Given: - Distance downstream = 28 km - Speed of the river's current = 3 km/h - Total time = 7 hours

Using the formula: Time downstream = Distance downstream / Speed downstream **Time