Question

Помогите с задачай из поселка одновремено в противоположных направлениях вышел пешеход и выехал велосипедист.Когда велосипедист проехал 22км со скоростью 11 км/ч, расстояние между ними стало 30 км . С какой скоростью шелпешеход //////пж помогите

Answer 1

А чу сложного то? 4 км в час. Так как велосипедист проехал 22 км, следовательно пешеходу осталось 8 км, а так как велосипедист ехал 2 часа(22\11) то и 8 км надо разделить на 2 и будет 4
Ответ 4

Answer 2

Problem Analysis

To solve this problem, we can use the concept of relative speed. We'll calculate the speed of the pedestrian by first finding the speed of the cyclist and then using the relative speed to determine the pedestrian's speed.

Calculating the Cyclist's Speed

The cyclist traveled 22 km at a speed of 11 km/h. We can use the formula: \[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \] So, the time taken by the cyclist is: \[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{22 \text{ km}}{11 \text{ km/h}} = 2 \text{ hours} \]

Calculating the Pedestrian's Speed

Now, we can use the relative speed formula to find the pedestrian's speed. The relative speed of the pedestrian with respect to the cyclist is the difference in their speeds, which is: \[ \text{Relative Speed} = \text{Speed of Pedestrian} - \text{Speed of Cyclist} \] Given that the distance between them became 30 km after the cyclist traveled 22 km, we can calculate the time taken by the pedestrian to cover the remaining distance: \[ \text{Time} = \frac{\text{Distance}}{\text{Relative Speed}} = \frac{30 \text{ km} - 22 \text{ km}}{\text{Relative Speed}} = \frac{8 \text{ km}}{\text{Relative Speed}} \]

Equating the time taken by the cyclist and the pedestrian, we get: \[ 2 \text{ hours} = \frac{8 \text{ km}}{\text{Relative Speed}} \]

Solving for the pedestrian's speed: \[ \text{Relative Speed} = \frac{8 \text{ km}}{2 \text{ hours}} = 4 \text{ km/h} \]

The pedestrian's speed is 4 km/h.