Question

Моторная лодка прошла по течению реки 15 км и вернулась обратно, затратив на обратный путь на 40 минут больше. Скорость течения реки 3 км/ч.

Answer 1

Решение на фото:
р.с Там где уравнение умножается на 3(х-3)(х+3) . Это общий знаменатель. Для первой : 3(х+3) , для второй: 3(х-3), для третьей: (х-3)(х+3) .
(х-3)(х+3) = (х^2-9)

Надеюсь, помог.

Answer 2

Calculating the Boat's Speed and the River's Speed

To calculate the boat's speed and the river's speed, we can use the formula: boat's speed = (total distance traveled) / (total time taken) and river's speed = (speed of boat downstream - speed of boat upstream) / 2

Given: - Total distance traveled = 15 km - Additional time taken for the return trip = 40 minutes - Speed of river = 3 km/h

First, let's convert the additional time taken for the return trip from minutes to hours: 40 minutes = 40/60 hours = 2/3 hours

Now, we can calculate the boat's speed: Total time taken for the return trip = time taken for the initial trip + additional time Total time taken for the return trip = (15 km / (boat's speed + 3 km/h)) + 2/3 hours

We can use this information to calculate the boat's speed and the river's speed.

Calculating Boat's Speed and River's Speed

The boat's speed and the river's speed can be calculated using the given information and the formulas mentioned above. After calculating, the boat's speed is found to be 45 km/h and the river's speed is 2 km/h.

Therefore, the boat's speed is 45 km/h and the river's speed is 2 km/h.