Question

Собственная скорость лодки-12 км/ч, а скорость течения реки-3 км/ч. Какое расстояние преодолеет лодка за 3/5 часа, если будет плыть против течения?

Answer 1

(12-3)*3/5=9*3/5=5,4(км)

Answer 2

Calculation of Distance Traveled

To calculate the distance the boat will cover in 3/5 hours while moving against the current, we can use the formula:

Distance = Speed of the boat * Time

Given that the boat's speed is 12 km/h and the speed of the river current is 3 km/h, we need to subtract the speed of the current from the boat's speed to determine the effective speed of the boat against the current.

Effective Speed of the boat = Speed of the boat - Speed of the current

Substituting the given values:

Effective Speed of the boat = 12 km/h - 3 km/h = 9 km/h

Now, we can calculate the distance traveled:

Distance = Effective Speed of the boat * Time

Substituting the given time of 3/5 hours:

Distance = 9 km/h * (3/5) hours

To simplify the calculation, we can convert 3/5 hours to minutes:

3/5 hours = (3/5) * 60 minutes = 36 minutes

Substituting the values:

Distance = 9 km/h * 36 minutes

To convert the distance from minutes to hours, we divide by 60:

Distance = (9 km/h * 36 minutes) / 60

Simplifying the calculation:

Distance = 5.4 km

Therefore, the boat will cover a distance of 5.4 km in 3/5 hours while moving against the current.