Question

Собственная скорость моторной лодки 8км/ч.Скорость течения реки 1 2/5 км/ч.Лодка шла 2 часа против течения реки и 2 часа по течению реки.Какой путь прошла мотроная лодка за эти 4 часа

Answer 1

1.2/5км=1.25км/ч-ск течения реки
8х4=32км-прошла лодка
2часа по течению и 2часа против взаимно уничтожаются 

Answer 2

Calculating the Distance Traveled by the Motorboat

To calculate the distance traveled by the motorboat in 4 hours, we can use the formula: distance = speed × time.

Given: - Speed of the motorboat = 8 km/h - Speed of the river's current = 1 2/5 km/h - Time spent traveling against the current = 2 hours - Time spent traveling with the current = 2 hours

Calculations

1. Speed of the motorboat relative to the water: - Against the current: 8 km/h - 1 2/5 km/h = 6 3/5 km/h. - With the current: 8 km/h + 1 2/5 km/h = 9 2/5 km/h.

2. Distance traveled: - Against the current: 6 3/5 km/h × 2 hours = 12 3/5 km. - With the current: 9 2/5 km/h × 2 hours = 18 4/5 km.

3. Total distance traveled in 4 hours: - 12 3/5 km + 18 4/5 km = 31 7/10 km.

Therefore, the motorboat traveled a distance of 31 7/10 km in the 4 hours.