Question

Расстояние между двумя городами по реке равное 90 км по течению прошел за 5 часов катер после остановки катер отправился обратно и прошёл 84 км за 6 часов какова скорость течения реки

Answer 1

90/5=18 (км/ч) по течению
84/6=14 (км/ч) против течения
(18-14)/2=2 (км/ч) скорость течения
18-2=16 (км/ч) скорость катера

Answer 2

Calculation of River Current Speed

To calculate the speed of the river current, we can use the formula:

Speed = Distance / Time

Given that the boat traveled 90 km downstream in 5 hours and 84 km upstream in 6 hours, we can calculate the speed of the river current.

Let's calculate the speed of the river current using the given information:

1. Downstream speed: - Distance = 90 km - Time = 5 hours - Speed = Distance / Time = 90 km / 5 hours = 18 km/h 2. Upstream speed: - Distance = 84 km - Time = 6 hours - Speed = Distance / Time = 84 km / 6 hours = 14 km/h To find the speed of the river current, we can use the following formula:

Speed of River Current = (Downstream Speed - Upstream Speed) / 2

Let's calculate the speed of the river current:

- Downstream speed = 18 km/h - Upstream speed = 14 km/h

Speed of River Current = (18 km/h - 14 km/h) / 2 = 4 km/h

Therefore, the speed of the river current is 4 km/h.

Please note that the calculation assumes a constant speed of the river current throughout the journey.