Question

Автомобиль должен за 7 часов проехать расстояние 630 км. первые 2 часа он ехал со скоростью 70 км/час , а следующие 3 часа увеличил скорость на 20 км/ час. с какой скоростью должен ехать автомобиль оставшийся путь, чтобы прибыть в назначеное место вовремя? помогите пожалуйста решить задачу

Answer 1

1)2*70=140 первые два часа
2)70+20=90 скорость в след. 3 часа
3)90*3=270 км проехал за 3 ч.
4)140+270=410 км за 5 ч
5)630-410=220
6)220:2=110 км .ч он должен ехать оставшееся время

Answer 2

Solution to the Problem:

To solve this problem, we can use the formula:

Distance = Speed × Time

We know that the total distance to be covered is 630 km and the time taken is 7 hours. We also know the speeds for the first 2 hours and the next 3 hours. We can use this information to calculate the speed needed for the remaining 2 hours.

Let's calculate the speed for the remaining distance.

1. Calculate the distance covered in the first 2 hours: - Speed for the first 2 hours = 70 km/h - Distance covered in the first 2 hours = Speed × Time = 70 km/h × 2 h = 140 km

2. Calculate the distance covered in the next 3 hours: - Speed for the next 3 hours = 70 km/h + 20 km/h = 90 km/h - Distance covered in the next 3 hours = Speed × Time = 90 km/h × 3 h = 270 km

3. Calculate the remaining distance: - Remaining distance = Total distance - (Distance covered in the first 2 hours + Distance covered in the next 3 hours) = 630 km - (140 km + 270 km) = 220 km

4. Calculate the speed needed for the remaining 2 hours: - Speed = Distance / Time = 220 km / 2 h = 110 km/h

Therefore, the car should travel at a speed of 110 km/h for the remaining 2 hours to arrive at the destination on time.

Additional Note:

It's important to note that the sources provided did not contain relevant information for solving this specific math problem. Therefore, the solution provided is based on the standard formula for distance, speed, and time calculations.