Question

Лодлка шла по озеру 8,5 км/ч в течение 3,5 ч , а затем 2,5 Ч вниз по реке.Какое расстояние прошла лодка , если ее скорость не менялась , а скорость течения реки состовляла 1,3 км/ч?

Answer 1

8,5*3,5 = 29,75 км - прошла лодка по озеру.
8,5+1,3 = 9,8 км/ч - скорость лодки по течению.
9,8*2,5 = 24,5 км - прошла лодка по реке.
29,75+24,5 = 54,25 км - всего прошла лодка.

Answer 2

Calculation of Distance Traveled by the Boat

To calculate the distance traveled by the boat, we need to consider the time it spent traveling on the lake and the time it spent traveling downstream on the river.

Given: - Speed of the boat on the lake: 8.5 km/h - Time spent on the lake: 3.5 hours - Speed of the river current: 1.3 km/h - Time spent downstream on the river: 2.5 hours

To calculate the distance traveled on the lake, we can use the formula:

Distance = Speed × Time

Distance on the lake = 8.5 km/h × 3.5 hours = 29.75 km

To calculate the distance traveled downstream on the river, we need to consider the combined speed of the boat and the river current. Since the boat is moving downstream, we can add the speed of the river current to the speed of the boat:

Combined speed downstream = Speed of the boat + Speed of the river current = 8.5 km/h + 1.3 km/h = 9.8 km/h

Distance downstream = Combined speed downstream × Time spent downstream = 9.8 km/h × 2.5 hours = 24.5 km

Therefore, the total distance traveled by the boat is the sum of the distance on the lake and the distance downstream on the river:

Total distance = Distance on the lake + Distance downstream = 29.75 km + 24.5 km = 54.25 km

So, the boat traveled a distance of 54.25 km.