Question

Помогите решить задачу. ОТ дома до озера 30 км. Велосипедист от дома до озера ехал со средней скоростью 15 км\ч, а обратно ---со средней скоростью 10км\ ч. ЗА какое время велосипедист проедет от дома до озера и вернётся обратно

Answer 1

30/15+30/10=2+3=5 часов туда и обратно

Answer 2

Problem Analysis

To solve this problem, we need to find the time it takes for the cyclist to travel from home to the lake and back. We are given that the distance from home to the lake is 30 km. The cyclist travels to the lake with an average speed of 15 km/h and returns with an average speed of 10 km/h.

Solution

To find the time it takes for the cyclist to travel from home to the lake and back, we can use the formula:

Time = Distance / Speed

Let's calculate the time for each leg of the journey.

1. Time to travel from home to the lake: - Distance: 30 km - Speed: 15 km/h - Time = 30 km / 15 km/h = 2 hours

2. Time to travel from the lake back to home: - Distance: 30 km - Speed: 10 km/h - Time = 30 km / 10 km/h = 3 hours

Now, let's calculate the total time for the round trip:

Total Time = Time to travel from home to the lake + Time to travel from the lake back to home

Total Time = 2 hours + 3 hours = 5 hours

Therefore, the cyclist will take 5 hours to travel from home to the lake and back.

Answer

The cyclist will take 5 hours to travel from home to the lake and back.

Note: The sources provided did not directly answer the question, so the solution was derived using basic mathematical calculations.