Question

Из дома в школу Василий шел 120 минут его скорость была 4 км в час. А назад этот путь проехал на автобусе. Сколько времени потратил Василий на обратный путь,если за 15 мин автобус проехал 12 км.

Answer 1

120 мин=2 часа (1 час=60 мин)
15 мин=1/4 часа
4 км/час*2 час=8 км (от дома до школы и наоборот) (S=Vt)
12 км:1/4 час=48 км/час (скорость автобуса) (V=S:t)
8 км:48 км/час=8/48 час=1/6 час=10 мин (t=S:V)
Ответ: на обратный путь Василий потратил 10 минут

Answer 2

Calculation of Time for the Forward Journey

To calculate the time Vasily spent on his forward journey, we can use the formula:

Time = Distance / Speed

Given that Vasily walked for 120 minutes (or 2 hours) and his speed was 4 km/h, we can calculate the distance using the formula:

Distance = Speed * Time

Substituting the values, we get:

Distance = 4 km/h * 2 hours = 8 km

Therefore, Vasily walked a distance of 8 km on his way to school.

Calculation of Time for the Return Journey

To calculate the time Vasily spent on his return journey, we can use the formula:

Time = Distance / Speed

Given that the bus traveled 12 km in 15 minutes, we can calculate the speed of the bus using the formula:

Speed = Distance / Time

Substituting the values, we get:

Speed = 12 km / 15 minutes

To convert the time from minutes to hours, we divide by 60:

Speed = 12 km / (15 minutes / 60 minutes/hour) = 48 km/h

Now, we can calculate the time Vasily spent on his return journey using the formula:

Time = Distance / Speed

Substituting the values, we get:

Time = 8 km / 48 km/h

Simplifying, we find:

Time = 0.1667 hours

Converting this to minutes, we multiply by 60:

Time = 0.1667 hours * 60 minutes/hour = 10 minutes

Therefore, Vasily spent 10 minutes on his return journey.

Answer

Vasily spent 10 minutes on his return journey.