Question

Туристу надо было пройти 27 км. Ранним утром он шёл 2ч со скоростью 5 км в час затем следущие 2ч со скоростью 4км в час а остальной путь прошёл за 3 ч . Чему была равна его скорость на последнем участке пути если скорость его на этом участке не менялась

Answer 1

Надо найти V3
S=27 км   S=S1+S2+S3    
t1=2ч         V1=5км/ч
t2=2ч         V2=4км/ч
t3=3ч         V3-?км/ч
V3=S3/t3
S3=S-(S1+S2) 
S1=t1*V1
S2=t2*V2
S3=S-(t1*V1+t2*V2)=27-(2*5+4*2)=27-(10+8)=27-18=9
V3=S3/t3=9/3=3км/ч

Answer 2

Ну тут всё просто нужно 27км:2ч=13,5км

Answer 3

Problem Analysis

A tourist needs to cover a distance of 27 km. They walked for 2 hours at a speed of 5 km/h, then another 2 hours at a speed of 4 km/h, and finally covered the remaining distance in 3 hours. We need to determine the speed at which the tourist covered the last part of the journey, assuming their speed did not change.

Solution

To solve this problem, we can use the formula:

Speed = Distance / Time

Let's calculate the distance covered in the first two hours:

Distance1 = Speed1 * Time1 = 5 km/h * 2 h = 10 km

Next, let's calculate the distance covered in the next two hours:

Distance2 = Speed2 * Time2 = 4 km/h * 2 h = 8 km

Now, let's calculate the remaining distance:

Remaining Distance = Total Distance - Distance1 - Distance2 = 27 km - 10 km - 8 km = 9 km

Finally, let's calculate the speed at which the tourist covered the remaining distance:

Speed3 = Remaining Distance / Time3 = 9 km / 3 h = 3 km/h

Therefore, the speed at which the tourist covered the last part of the journey was 3 km/h.

Answer

The speed at which the tourist covered the last part of the journey, assuming their speed did not change, was 3 km/h.