Question

Экскурсанты за день прошли 12,4 км. С утра они шли 3 час(-а), а после обеда еще 1 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

Х*1+(х+2)3=12,4 х+3х+6=12,4  4х=12,4-6  4х=6,4  х=1,6  скорость после обеда 1,6+2=3,6 скорость утром

Answer 2

Problem Analysis

The problem states that a group of tourists walked a total of 12.4 km in a day. They walked for 3 hours in the morning and 1 hour after lunch. The speed of the tourists decreased by 2 km/h after lunch. We need to determine how many kilometers the tourists walked in the morning and at what speed they were walking.

Solution

Let's assume that the speed of the tourists in the morning was x km/h. We can set up the following equation to represent the total distance walked:

Distance walked in the morning + Distance walked after lunch = Total distance walked

Using the formula distance = speed × time, we can write the equation as:

x km/h × 3 hours + (x - 2) km/h × 1 hour = 12.4 km

Now, let's solve this equation to find the value of x and the distance walked in the morning.

Calculation

x × 3 + (x - 2) × 1 = 12.4

3x + x - 2 = 12.4

4x - 2 = 12.4

4x = 14.4

x = 14.4 / 4

x = 3.6

Therefore, the speed of the tourists in the morning was 3.6 km/h.

To find the distance walked in the morning, we can substitute the value of x into the equation:

Distance walked in the morning = x km/h × 3 hours = 3.6 km/h × 3 hours = 10.8 km

Therefore, the tourists walked 10.8 km in the morning at a speed of 3.6 km/h.

Answer

The tourists walked 10.8 km in the morning, and their speed was 3.6 km/h.