Question

Катер плыл по озеру полчаса со скоростью 13,2 км/ч, а потом плыл обратно со скоростью, которая меньше прежней на 1,2 км/ч. Какое время понадобилось катеру на обратный путь

Answer 1

За полчаса со скоростью 13,2 км/ч катер проплыл 13,2 : 2 = 6,6 км.
Обратно он шел со скоростью 13,2 - 1,2 = 12 км/ч.
Значит, 6,6 км он мог проплыть за 6,6 / 12 = 0,55 ч = 33 минуты.

Answer 2

Calculation of Time for the Return Journey of the Boat

To calculate the time required for the return journey of the boat, we need to consider the distance traveled and the speed of the boat.

Given information: - The boat traveled on the lake for half an hour at a speed of 13.2 km/h. - On the return journey, the boat traveled at a speed that was 1.2 km/h slower than the previous speed.

Let's break down the problem step by step:

1. Calculate the distance traveled in the first half-hour: - Distance = Speed × Time - Distance = 13.2 km/h × 0.5 h - Distance = 6.6 km

2. Calculate the speed of the boat on the return journey: - Speed on the return journey = Previous speed - 1.2 km/h - Speed on the return journey = 13.2 km/h - 1.2 km/h - Speed on the return journey = 12 km/h

3. Calculate the time required for the return journey: - Time = Distance / Speed - Time = 6.6 km / 12 km/h - Time = 0.55 hours

Therefore, it took the boat approximately 0.55 hours (or 33 minutes) for the return journey.

Please note that the above calculation assumes a constant speed throughout the journey and does not account for any external factors that may affect the boat's speed or the actual distance traveled.