Question

Угонщики автомобиля спасаются бегством от полиции со скоростью 80 км.С какой скоростью ехала полицейская машина, догнавшая угонщиков через полчаса если она начала преследованье через 15 мин после угона?

Answer 1

15 мин это 1/4 часа. пол часа это 1/2 часа.
80×1/4=20 км проехали угонщики за 15 мин.
20÷1/2=40 км/ч. На 40 км /ч больше должна быть скорость полицейской машины.
80+40= 120 км/ч ехала полицейская машина.
Ответ: 120 км/ч.

Answer 2

Calculation of the Police Car's Speed

To determine the speed of the police car, we can use the formula:

Speed = Distance / Time

Let's break down the information given in the question:

- The car thieves are fleeing at a speed of 80 km/h. - The police car starts chasing the thieves 15 minutes (0.25 hours) after the car theft. - The police car catches up to the thieves after half an hour (0.5 hours).

To find the distance traveled by the thieves, we can use the formula:

Distance = Speed × Time

The time taken by the thieves can be calculated by subtracting the time the police car started chasing from the time it took to catch up to them:

Time taken by the thieves = Time taken by the police car - Time taken by the police car to start chasing

Let's calculate the distance traveled by the thieves:

Distance traveled by the thieves = Speed of the thieves × Time taken by the thieves

Now, we can calculate the speed of the police car:

Speed of the police car = Distance traveled by the thieves / Time taken by the police car

Let's plug in the values and calculate the speed of the police car.