Question

Расстояние между автомобилем ивелосипедистом 120км. через какое время автомобили ст догонит велосипедист, если скорость велосипедист 20км/ч, а скорость автомобиля в 4 раза больше.

Answer 1

20 км/час * 4 = 80 км/час (скорость авто)
80 км/час - 20 км/час = 60 км/час ( скорость сближения)
t=S:V
120 км : 60 км/час = 2 часа
Ответ: через 2 часа автомобиль догонит велосипед

Answer 2

Calculation of Time for the Car to Catch the Cyclist

To calculate the time it takes for the car to catch up to the cyclist, we can use the formula:

Time = Distance / Relative Speed

Given that the distance between the car and the cyclist is 120 km, the speed of the cyclist is 20 km/h, and the speed of the car is 4 times greater than the speed of the cyclist, we can calculate the relative speed of the car:

Relative Speed = Car Speed - Cyclist Speed

Relative Speed = (4 * Cyclist Speed) - Cyclist Speed

Relative Speed = 3 * Cyclist Speed

Substituting the values, we get:

Relative Speed = 3 * 20 km/h = 60 km/h

Now we can calculate the time it takes for the car to catch up to the cyclist:

Time = Distance / Relative Speed

Time = 120 km / 60 km/h

Time = 2 hours

Therefore, the car will catch up to the cyclist in 2 hours.