Question

Пассажир такси по часам и спидометру определил, что 15 минут автомобиль двигался со скоростью 40 км/ч, 3 минуты - 30 км/ч и 5 минут - 20 км/ч. Определите среднюю скорость автомобиля за первые семь минут движения. Ответ дайте в м/с и округлите до целых

Answer 1

Ответ:

11 м/с

Объяснение:

т.к. первые 15 минут автомобиль ехал со скоростью 40 км/ч, а нам надо узнать среднюю скорость за первые 7 минут, то с какой скоростью он ехал дальше нас не интересует.

40  км/ч *1000 : 3500 = 11 м/с скорость автомобиля за первые семь минут движения

Answer 2

Calculation of Average Speed

To calculate the average speed of the car for the first seven minutes of travel, we need to find the total distance traveled and divide it by the total time taken.

Given the following information: - 15 minutes at 40 km/h - 3 minutes at 30 km/h - 5 minutes at 20 km/h

We can calculate the total distance traveled as follows:

Total distance = (15 minutes * 40 km/h) + (3 minutes * 30 km/h) + (5 minutes * 20 km/h)
              = (600 km) + (90 km) + (100 km)
              = 790 km

The total time taken is 7 minutes.

To find the average speed, we divide the total distance by the total time:

Average speed = Total distance / Total time
             = 790 km / 7 minutes

To convert the average speed to m/s, we need to convert the distance from kilometers to meters and the time from minutes to seconds:

Average speed = (790 km * 1000 m/km) / (7 minutes * 60 s/minute)
             = 11314.29 m / 420 s

Rounding to the nearest whole number, the average speed of the car for the first seven minutes of travel is approximately 27 m/s.

Please note that the calculation assumes a constant speed during each interval and does not take into account any acceleration or deceleration that may have occurred during the transitions between speeds.