Question

Грузовой автомобиль должен проехать 579 км за 15 ч.По просёлочной дороге он ехал 9ч со скоростью 35 км/ч а потом выехал на шоссе.С какой скоростью он должен двигаться по шоссе,чтобы своевременно прибыть к месту назначения?

Answer 1

Должен проехать 579км- за 15ч
Ехал 9ч за 35 км\ч
С какой скоростьюдолжен двигаться?

1) 35 * 9 = 315 (км)- по просёлочной дороге
2) 579 - 315 = 264 (км)- проехать по шоссе
3) 15 - 9 = 6 (часов)- осталось проехать по шоссе
4) 264 : 6 =44 (км/ч)-  по шоссе
Ответ : Он должен двигаться со скоростью 44 км /ч

Answer 2

Calculation of Average Speed on the Dirt Road

To determine the speed at which the truck should travel on the highway, we first need to calculate the average speed at which it traveled on the dirt road.

The truck traveled for 9 hours on the dirt road at a speed of 35 km/h. To find the distance traveled on the dirt road, we can use the formula:

Distance = Speed × Time

Substituting the given values, we have:

Distance on the dirt road = 35 km/h × 9 h = 315 km.

Calculation of Remaining Distance

Since the total distance the truck needs to travel is 579 km, and it has already traveled 315 km on the dirt road, the remaining distance to be covered on the highway is:

Remaining distance = Total distance - Distance on the dirt road = 579 km - 315 km = 264 km.

Calculation of Speed on the Highway

To calculate the speed at which the truck should travel on the highway, we can use the formula:

Speed = Distance / Time

Substituting the values, we have:

Speed on the highway = 264 km / (15 h - 9 h) = 264 km / 6 h = 44 km/h.

Therefore, the truck should travel at a speed of 44 km/h on the highway to arrive at its destination on time.

Please note that these calculations assume a constant speed throughout the journey and do not account for factors such as traffic or road conditions.

Let me know if there's anything else I can help you with!