Question

Собственная скорость моторной лодки равна 48,2 км/ч, а ее скорость против течения реки - 45,5 км/ч. какое расстояние пройдет лодка по течению реки за 6 часов? а) 305,4 км. б)289,2 км. в)273 км. г)321 км. Помогите пожалуйста, очень нужно на завтра)))

Answer 1

1)48.2-45.5=2.7 течение реки
2)48.2+2.7=50.9 скорость по течению реки
3)50.9*6=305.4км

Answer 2

Problem Analysis

We are given the speed of a motorboat and the speed of the river's current. We need to find the distance the boat will travel downstream in 6 hours.

Given Information

- Speed of the motorboat = 48.2 km/h - Speed of the river's current = 45.5 km/h - Time = 6 hours

Approach

To find the distance the boat will travel downstream, we need to calculate the effective speed of the boat when moving downstream. The effective speed is the sum of the boat's speed and the speed of the river's current.

Once we have the effective speed, we can calculate the distance traveled by multiplying the effective speed by the time.

Let's calculate the effective speed and the distance traveled downstream.

Calculation

The effective speed of the boat when moving downstream is the sum of the boat's speed and the speed of the river's current: Effective speed = Speed of the boat + Speed of the river's current

Substituting the given values: Effective speed = 48.2 km/h + 45.5 km/h

Now, we can calculate the distance traveled downstream by multiplying the effective speed by the time: Distance traveled downstream = Effective speed * Time

Substituting the given values: Distance traveled downstream = (48.2 km/h + 45.5 km/h) * 6 hours

Solution

Let's calculate the distance traveled downstream using the given values.

The effective speed of the boat when moving downstream is: Effective speed = 48.2 km/h + 45.5 km/h = 93.7 km/h

The distance traveled downstream in 6 hours is: Distance traveled downstream = (48.2 km/h + 45.5 km/h) * 6 hours = 93.7 km/h * 6 hours = 562.2 km

Therefore, the boat will travel 562.2 km downstream in 6 hours.

Answer

The correct answer is 562.2 km.