Question

Расстояние между двумя причалами 35 км. Сколько времени потратит теплоход на путь от одного причала до другого и обратно, если собственная скорость теплохода 17км/ч, а скорость течения реки - 3км/ч.

Answer 1

17+3=20 (км/ч) - скорость по течению

17-3=14 (км/ч) - скорость против течения

35:20+35:14=1,75+2,5=4,25 (ч.) - потратит теплоход на путь от одного причала до другого и обратно 

Answer 2

Calculation of Time Taken by the Boat

To calculate the time taken by the boat to travel from one pier to another and back, we need to consider the distance between the piers, the speed of the boat, and the speed of the river current.

Given: - Distance between the piers: 35 km - Boat's speed: 17 km/h - River current speed: 3 km/h

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

Time = Distance / Speed

Since the boat is traveling from one pier to another and then back, we need to consider the total distance traveled, which is twice the distance between the piers.

Let's calculate the time taken by the boat step by step:

1. Calculate the time taken by the boat to travel from one pier to another: - Distance: 35 km - Boat's speed: 17 km/h - Time = Distance / Speed = 35 km / 17 km/h = 2.06 hours

2. Calculate the time taken by the boat to travel back from the second pier to the first pier: - Distance: 35 km - Boat's speed: 17 km/h - Time = Distance / Speed = 35 km / 17 km/h = 2.06 hours

3. Calculate the total time taken by the boat for the round trip: - Total time = Time taken to travel from one pier to another + Time taken to travel back - Total time = 2.06 hours + 2.06 hours = 4.12 hours

Therefore, the boat will take approximately 4.12 hours to travel from one pier to another and back, considering its own speed of 17 km/h and the river current speed of 3 km/h.