Question

Экскурсанты за день прошли 21,8 км. С утра они шли 5 час(-а), а после обеда — ещё 3 час(-а). Сколько километров экскурсанты прошли утром, если после обеда их скорость снизилась на 1 км/ч. С какой скоростью шли экскурсанты утром? Экскурсанты утром прошли ___ км со скоростью _____ км/ч.

Answer 1

Ответ:

16.8 км 19 км/час

Объяснение:

поставь 5 звезд

Answer 2

Problem Analysis

We are given that a group of tourists walked a total distance of 21.8 km in a day. They walked for 5 hours in the morning and an additional 3 hours after lunch. The speed of the tourists decreased by 1 km/h after lunch. We need to determine the distance the tourists walked in the morning and their speed during that time.

Solution

Let's denote the distance walked in the morning as x km and the speed during that time as v km/h. We can set up the following equation based on the given information:

x = v * 5 (distance = speed * time)

We also know that the total distance walked in the day is 21.8 km, so we can set up another equation:

x + (x - 1) * 3 = 21.8 (distance in the morning + distance after lunch = total distance)

Simplifying the second equation, we get:

4x - 3 = 21.8

Solving this equation will give us the value of x, which represents the distance walked in the morning. We can then calculate the speed v by dividing this distance by 5.

Let's solve the equations to find the values of x and v.

Calculation

4x - 3 = 21.8

Adding 3 to both sides:

4x = 24.8

Dividing both sides by 4:

x = 6.2

The tourists walked a distance of 6.2 km in the morning. To find the speed, we divide this distance by 5:

v = 6.2 / 5 = 1.24 km/h

Answer

The tourists walked a distance of 6.2 km in the morning at a speed of 1.24 km/h.