Question

В первый день автомобиль проехал за 7 часов 560 км во второй день он ехал с прежней скоростью и был в пути 9 ч какой путь со скоростью 80 км/ч.расстояние от одного города до другого 30 км а от другого до третьего 600 км за какое время можно доехать от первого города до третьего со скоростью 90 км/ч.Велосипедиста ехал до обеда 5 ч со скорость 15 км/ч после обеда он ехал ещё какова была его скорость после обеда если весь путь равен 131 км.

Answer 1

№2  1) 30 + 600 = 630 км (расстояние между первым и третьим городами)
       2)  630 : 90  = 7 час ( можно проехать от первого до третьего города)
№3  1) 5*15 = 75 км (проехал велосипедист до обеда)
       2) 131 - 75 = 56 км (проехал велосипедист после обеда)
       3) 56 : ?  =  ? км/час (скорость велосипедиста после обеда)
       В твоей задаче нет времени сколько ехал велосипедист, вместо первого вопроса в п.3 подставь нужное число и получишь скорость

Answer 2

Calculation of Distance and Time for the Car Journey

To calculate the distance and time for the car journey, we can use the formula:

Distance = Speed × Time

In the first day, the car traveled 560 km in 7 hours. Therefore, the speed of the car on the first day was:

Speed = Distance / Time = 560 km / 7 hours = 80 km/h.

On the second day, the car traveled for 9 hours with the same speed as the first day. To find the distance traveled on the second day, we can use the same formula:

Distance = Speed × Time = 80 km/h × 9 hours = 720 km.

Calculation of Time for Traveling from the First City to the Third City

To calculate the time it takes to travel from the first city to the third city at a speed of 90 km/h, we need to consider the distances between the cities.

The distance from the first city to the second city is 30 km, and the distance from the second city to the third city is 600 km. Therefore, the total distance from the first city to the third city is:

Total Distance = Distance from First City to Second City + Distance from Second City to Third City = 30 km + 600 km = 630 km.

To calculate the time, we can use the formula:

Time = Distance / Speed = 630 km / 90 km/h = 7 hours.

Therefore, it would take approximately 7 hours to travel from the first city to the third city at a speed of 90 km/h.

Calculation of the Speed of the Cyclist after Lunch

To calculate the speed of the cyclist after lunch, we need to consider the total distance traveled and the time taken.

Before lunch, the cyclist traveled for 5 hours at a speed of 15 km/h. Therefore, the distance traveled before lunch is:

Distance before Lunch = Speed × Time = 15 km/h × 5 hours = 75 km.

The total distance traveled is given as 131 km. Therefore, the distance traveled after lunch is:

Distance after Lunch = Total Distance - Distance before Lunch = 131 km - 75 km = 56 km.

The time taken after lunch is given as the remaining time until the end of the journey, which is 131 km in total. Therefore, the time taken after lunch is:

Time after Lunch = Total Time - Time before Lunch = 131 km / Speed after Lunch.

To calculate the speed after lunch, we can rearrange the formula:

Speed after Lunch = Distance after Lunch / Time after Lunch = 56 km / (131 km / Speed after Lunch).

Simplifying the equation, we get:

Speed after Lunch = (56 km × Speed after Lunch) / 131 km.

Solving for Speed after Lunch, we find:

Speed after Lunch = 56 km / 131 km ≈ 0.427 km/h.

Therefore, the speed of the cyclist after lunch is approximately 0.427 km/h.