Question

За 3/4 часа автомобиль проехал 60 км. Найдите скорость автомобиля. Скорость пешехода 4 км/ч. За какое время он пройдёт 5 км? Выразите ответ в минутах,Помогите пожалуйста .очень надо!!!

Answer 1

60:4·3=15·3=45
ответ:45 км/ч скорость автомобиля

Answer 2

Calculation of Car Speed:

To find the speed of the car, we can use the formula:

Speed = Distance / Time

Given that the car traveled 60 km in 3/4 of an hour, we can substitute these values into the formula:

Speed = 60 km / (3/4) hour

To simplify the calculation, we can convert 3/4 hour to minutes. Since 1 hour is equal to 60 minutes, 3/4 hour is equal to (3/4) * 60 = 45 minutes.

Speed = 60 km / 45 minutes

To express the speed in km/h, we need to convert the time from minutes to hours. Since 1 hour is equal to 60 minutes, 45 minutes is equal to 45/60 = 0.75 hours.

Speed = 60 km / 0.75 hours

Now we can calculate the speed of the car:

Speed = 80 km/h

Therefore, the speed of the car is 80 km/h.

Calculation of Pedestrian's Time:

To find the time it takes for the pedestrian to walk 5 km, we can use the formula:

Time = Distance / Speed

Given that the pedestrian's speed is 4 km/h and the distance is 5 km, we can substitute these values into the formula:

Time = 5 km / 4 km/h

To express the time in minutes, we need to convert the time from hours to minutes. Since 1 hour is equal to 60 minutes, we can multiply the time by 60:

Time = (5 km / 4 km/h) * 60 minutes/hour

Now we can calculate the time it takes for the pedestrian to walk 5 km:

Time = (5 km / 4 km/h) * 60 minutes/hour

Time = 7.5 minutes

Therefore, it will take the pedestrian 7.5 minutes to walk 5 km.

I hope this helps! Let me know if you have any further questions.