Question

Расстояние от склада до магазина 18 км.a)Машина выехала со склада в магазин.За сколько минут машина преодолеет этот путь ,если еЁ средняя скорость равна 60 км/ч?б)На обратный путь от магазина до склада машина затратила одну четвЁртую часа.Вычисли среднюю скорость машины на обратном пути,если она едет по той же самой дороге.

Answer 1

а) 18км:60км/ч= 0.3 часа =20 минут

Answer 2

Calculation of Time Taken to Travel from Warehouse to Store

To calculate the time taken for the car to travel from the warehouse to the store, we can use the formula:

Time = Distance / Speed

a) Given that the distance from the warehouse to the store is 18 km and the average speed of the car is 60 km/h, we can substitute these values into the formula:

Time = 18 km / 60 km/h

To find the time in minutes, we need to convert the time from hours to minutes. Since there are 60 minutes in an hour, we can multiply the time in hours by 60:

Time = (18 km / 60 km/h) * 60 min/h

Simplifying the equation:

Time = 18 km * (60 min/h) / 60 km/h

Now we can calculate the time taken:

Time = 18 km * (60 min/h) / 60 km/h = 18 min

Therefore, it will take the car 18 minutes to travel from the warehouse to the store at an average speed of 60 km/h.

Calculation of Average Speed on the Return Journey

b) Given that the car took one-fourth of an hour (15 minutes) to travel from the store back to the warehouse, we can calculate the average speed on the return journey using the formula:

Speed = Distance / Time

Since the distance from the store to the warehouse is the same as the distance from the warehouse to the store (18 km), we can substitute these values into the formula:

Speed = 18 km / 15 min

To find the speed in km/h, we need to convert the speed from minutes to hours. Since there are 60 minutes in an hour, we can divide the speed in minutes by 60:

Speed = (18 km / 15 min) * 60 min/h

Simplifying the equation:

Speed = 18 km * (60 min/h) / 15 min

Now we can calculate the average speed on the return journey:

Speed = 18 km * (60 min/h) / 15 min = 72 km/h

Therefore, the average speed of the car on the return journey, traveling along the same road, is 72 km/h.