Question

Два пешехода вышли одновременно навстречу друг другу. Скорость одного из них 5,1 км/ч , и она больше скорости другого 0,7км/ч. Через 0,8 с они встретились. Какое расстояние было между ними в начале пути?

Answer 1

1)5.1-0.7=4.4км\ч-скорость второго.
2)5.1+4.4=9.5км\ч-скорость сближения.
3)9.5*0.8=7.6км-было между ними.

Answer 2

5,1-0,7=4,4 км/ч -скорость второго
5,1+4,4=9,5км/ч- скорость сближения

в 1 часе 60мин*60сек=3600сек
0,8/3600=0,1/450=1/4500ч-это 0,8с в часах (Вы не ошиблись???)
1/4500*9,5≈0,0021км=2,1м

Если там было 0,8мин, то
0,8/60=8/600=2/150=1/75ч
1/75*9,5=95/750=19/150≈0,127км=127м

Если там было 0,8ч, то
0,8*9,5=7,6км=7км600м

Answer 3

Problem Analysis

We are given that two pedestrians start walking towards each other simultaneously. The speed of one pedestrian is 5.1 km/h, which is 0.7 km/h faster than the speed of the other pedestrian. After 0.8 hours, they meet each other. We need to find the initial distance between them.

Solution

Let's assume the speed of the slower pedestrian is x km/h. Since the speed of the faster pedestrian is 0.7 km/h faster, their speed is x + 0.7 km/h.

We can use the formula distance = speed × time to find the distance traveled by each pedestrian.

The distance traveled by the slower pedestrian in 0.8 hours is 0.8x km.

The distance traveled by the faster pedestrian in 0.8 hours is 0.8(x + 0.7) km.

Since they meet each other, the sum of their distances traveled should be equal to the initial distance between them.

Therefore, we can set up the equation: 0.8x + 0.8(x + 0.7) = initial distance.

Simplifying the equation, we get: 1.6x + 0.56 = initial distance.

To find the initial distance, we need to know the value of x. We can use the given information that the speed of one pedestrian is 5.1 km/h to solve for x.

Let's solve for x:

x = 5.1 - 0.7 (since the speed of the slower pedestrian is 0.7 km/h less than the speed of the faster pedestrian)

x = 4.4 km/h.

Now, we can substitute the value of x into the equation to find the initial distance:

initial distance = 1.6(4.4) + 0.56.

Calculating this, we get:

initial distance = 7.04 + 0.56.

initial distance = 7.6 km.

Therefore, the initial distance between the two pedestrians was 7.6 km.

Answer

The initial distance between the two pedestrians was 7.6 km.