Question

Расстояние от дома до магазина 2000м. девочка прошла за 40 минут, а на обратном пути её скорость была на 30 метров в минуту больше за какое время она дошла обратно

Answer 1

S - весь путь
v - скорость 
v2 - скорость на обратном пути
t - время 
t2 - время на обратном пути
S=2000 м
t = 40 мин. 
v = ?
v = S/t
v=2000/40=50 (м/мин)

На обратном пути v больше на 30 м/мин. 
 v2=50+30=80 м/мин.
 t2=2000:80=25 мин.
Ответ: 25 мин.

Answer 2

2000:40=50м в мин
50+30=80метров в мин обратно
2000:80=25 МИН

Answer 3

Calculation of Time Taken to Return Home

To calculate the time taken for the girl to return home, we need to consider the distance from home to the store, the time taken to walk to the store, and the girl's speed on the return journey.

Given: - Distance from home to the store: 2000 meters - Time taken to walk to the store: 40 minutes - Speed on the return journey: 30 meters per minute faster than the initial speed

To find the time taken to return home, we can use the formula:

Time = Distance / Speed

Let's calculate the time taken to return home step by step:

1. Convert the time taken to walk to the store from minutes to seconds: - 40 minutes = 40 * 60 = 2400 seconds

2. Calculate the initial speed to the store: - Speed = Distance / Time - Speed = 2000 meters / 2400 seconds

3. Calculate the speed on the return journey: - Speed on the return journey = Initial speed + 30 meters per minute - Speed on the return journey = Initial speed + (30 meters / 60 seconds)

4. Calculate the time taken to return home: - Time = Distance / Speed on the return journey

Let's perform the calculations:

1. Convert the time taken to walk to the store from minutes to seconds: - 40 minutes = 40 * 60 = 2400 seconds

2. Calculate the initial speed to the store: - Speed = 2000 meters / 2400 seconds = 0.833 meters per second

3. Calculate the speed on the return journey: - Speed on the return journey = 0.833 meters per second + (30 meters / 60 seconds) = 0.833 meters per second + 0.5 meters per second = 1.333 meters per second

4. Calculate the time taken to return home: - Time = 2000 meters / 1.333 meters per second = 1500 seconds

Therefore, the girl took 1500 seconds to return home.