Question

Лодка проплыла 15 км против течения реки. Собственная скорость лодки 7км/ч,а скорость течения реки 2 км/ч. Сколько часов проплыла лодка?

Answer 1

1) 7-2=5 (км) - скорость лодки против течения.
2) 15:5= 3 (ч)

Ответ: лодка проплыла 15 км против течения за 3 часа.

Answer 2

Calculation of the Time Taken by the Boat

To calculate the time taken by the boat to travel a distance of 15 km against the current of the river, we need to consider the boat's own speed and the speed of the river current.

Given: - Distance traveled by the boat = 15 km - Speed of the boat = 7 km/h - Speed of the river current = 2 km/h

To find the time taken by the boat, we can use the formula:

Time = Distance / Speed

Substituting the given values into the formula, we get:

Time = 15 km / (7 km/h)

Simplifying the expression, we find:

Time = 2.14 hours

Therefore, the boat took approximately 2.14 hours to travel a distance of 15 km against the current of the river.