Question

Моторная лодка двигаясь против течения реки за 1.2 часа прошла 7.8 км. Какй путь пройдет эта лодка за 6 часов по течению реки. если скорсть течения равна 1.7 км в час.Пожалуйста помогите!!!

Answer 1

S = 7,8 км - путь против течения
t = 1,2 ч - время пути
1,7 км/ч - скорость течения реки
s = v * t - формула пути
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1) 7,8 : 1,2 = 6,5 (км/ч) - скорость моторной лодки против течения реки;
2) 6,5 + 1,7 = 8,2 (км/ч) - собственная скорость лодки;
3) 8,2 + 1,7 = 9,9 (км/ч) - скорость лодки по течению реки;
4) 9,9 * 6 = 59,4 (км) - путь лодки по течению реки.
Ответ: 59,4 км.

8,2 - 1,7 = 6,5 (км/ч) - скорость лодки против течения реки
8,2 + 1,7 = 9,9 (км/ч) - скорость лодки по течению реки 

Answer 2

Problem Analysis

We are given the following information: - A motorboat traveled 7.8 km against the current of a river in 1.2 hours. - The speed of the current is 1.7 km/h. - We need to find the distance the boat will travel in 6 hours with the current.

To solve this problem, we can use the formula: distance = speed × time.

Calculation

Let's calculate the speed of the boat when moving against the current: - Distance = 7.8 km - Time = 1.2 hours

Using the formula, we can find the speed of the boat against the current: speed = distance / time.

Substituting the given values, we have: speed = 7.8 km / 1.2 hours.

Now, let's calculate the speed of the boat with the current: - Speed of the current = 1.7 km/h - Speed of the boat against the current = 7.8 km / 1.2 hours

To find the speed of the boat with the current, we need to add the speed of the current to the speed of the boat against the current: speed with current = speed against current + speed of the current.

Substituting the given values, we have: speed with current = (7.8 km / 1.2 hours) + 1.7 km/h.

Now, we can calculate the distance the boat will travel in 6 hours with the current: - Time = 6 hours - Speed with current = (7.8 km / 1.2 hours) + 1.7 km/h

Using the formula, we have: distance = speed with current × time.

Substituting the given values, we have: distance = [(7.8 km / 1.2 hours) + 1.7 km/h] × 6 hours.

Let's calculate the distance using the given values.

Calculation Results

The distance the boat will travel in 6 hours with the current is approximately [[7.8 km / 1.2 hours + 1.7 km/h] × 6 hours]].

Please note that the actual calculation result may vary slightly depending on the precise values used.

Answer

The boat will travel approximately [[7.8 km / 1.2 hours + 1.7 km/h] × 6 hours]] with the current of the river.

I hope this helps! Let me know if you have any further questions.