Question

Экскурсанты за день прошли 12,9 км. С утра они шли 4 час(-а), а после обеда — ещё 3 час(-а). Сколько километров экскурсанты прошли утром, если после обеда их скорость снизилась на 2 км/ч. С какой скоростью шли экскурсанты утром?

Answer 1

Ответ:

4х+3(х-2)=12,9

4х+3х-6=12,9

7х=12,9+6

х-18,9:7

х=2,7 км/ч

Объяснение:

Answer 2

Calculation of Distance Covered in the Morning

To calculate the distance covered by the tourists in the morning, we need to subtract the distance covered in the afternoon from the total distance covered in the day.

Given: - Total distance covered in a day: 12.9 km - Time spent in the morning: 4 hours - Time spent in the afternoon: 3 hours - Speed reduction in the afternoon: 2 km/h

Let's calculate the distance covered in the afternoon first. We can use the formula:

Distance = Speed × Time

The speed in the afternoon would be the speed in the morning minus the reduction of 2 km/h. Let's assume the speed in the morning is x km/h. Therefore, the speed in the afternoon would be (x - 2) km/h.

The distance covered in the afternoon can be calculated as:

Distance in the afternoon = (x - 2) km/h × 3 hours

Now, we can calculate the distance covered in the morning:

Distance in the morning = Total distance covered in a day - Distance in the afternoon

Let's substitute the given values and calculate the distance covered in the morning.

Distance in the morning = 12.9 km - (x - 2) km/h × 3 hours

To find the value of x, we need additional information or assumptions about the speed in the morning. Unfortunately, the given question does not provide any specific information about the speed in the morning. Therefore, we cannot calculate the exact distance covered in the morning without this information.

If you have any additional information or assumptions about the speed in the morning, please provide them, and I will be happy to help you with the calculation.