Question

13. Расстояние между городами 420 км. Скорость машины 70 км/ч. Сколько времени машина потратит на весь путь, если на обратном пути она снизит скорость до 10 км/ч? а) 11 часов b) 14 часов с) 17 часов d) 15 часов e) 13 часов

Answer 1

Ответ:

е (13 часов)

Пошаговое объяснение:

1). 420÷70=6 часов

2). 70-10=60 км/ч

3). 420÷60=7 часов

4). 6+7=13 часов

Можно пж лучший ответ)))

Answer 2

Calculation of Time Taken

To calculate the time taken by the car to travel the entire distance, we can use the formula:

Time = Distance / Speed

Given that the distance between the cities is 420 km and the speed of the car is initially 70 km/h, we can calculate the time taken for the car to travel the entire distance:

Time = 420 km / 70 km/h = 6 hours Now, let's calculate the time taken for the car to travel back when it reduces its speed to 10 km/h.

Time = 420 km / 10 km/h = 42 hours

However, it is important to note that the time taken to travel back at a speed of 10 km/h is significantly longer than the time taken to travel to the destination. Therefore, the car will not be able to complete the return journey within a reasonable time frame.

Therefore, the correct answer is a) 11 hours.