Question

Двигаясь по течению реки, расстояние в 36 км моторная лодка проходит за 3 ч, а плот за — 18 ч. Вычисли скорость моторной лодки при движении против течения реки.

Answer 1

1)36:3=12 2) 18*12=216 км/ч

Answer 2

Calculation of the Speed of the Motorboat

To calculate the speed of the motorboat when moving against the current of the river, we need to use the given information about the distance traveled and the time taken by both the motorboat and the raft.

According to the information provided: - The motorboat travels a distance of 36 km in 3 hours when moving with the current of the river. - The raft takes 18 hours to cover the same distance.

To find the speed of the motorboat when moving against the current, we can use the formula:

Speed = Distance / Time

Let's calculate the speed of the motorboat when moving with the current first:

Motorboat speed with the current = 36 km / 3 hours = 12 km/h Now, let's calculate the speed of the raft:

Raft speed = 36 km / 18 hours = 2 km/h To find the speed of the motorboat when moving against the current, we need to subtract the speed of the raft from the speed of the motorboat when moving with the current:

Motorboat speed against the current = Motorboat speed with the current - Raft speed

Motorboat speed against the current = 12 km/h - 2 km/h = 10 km/h

Therefore, the speed of the motorboat when moving against the current of the river is 10 km/h.