Question

Из пункта А в пункт Б вышли 2 пешехода, причём второй вышел на час позже, чем первый. Через сколько второй пешеход догонит первого, если его скорость 6 км/ч, а скорость первого 4 км/ч?

Answer 1

Через два часа второй догонит первого, первый пройдет 3 часа (4км/ч*3ч) 12км/ч,второй пройдет это расстояние за 2 часа (6км/ч*2ч) 12 км

Answer 2

Problem Analysis

We have two pedestrians walking from point A to point B. The second pedestrian starts one hour later than the first pedestrian. We need to determine how long it will take for the second pedestrian to catch up to the first pedestrian, given their respective speeds.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's assume the distance between point A and point B is D.

The first pedestrian's speed is 4 km/h, so the time taken by the first pedestrian to cover the distance D is D / 4.

The second pedestrian's speed is 6 km/h, and they start one hour later than the first pedestrian. So, the time taken by the second pedestrian to cover the distance D is (D / 6) - 1.

To find the time it takes for the second pedestrian to catch up to the first pedestrian, we need to equate the two time values and solve for D.

Calculation

Let's solve the equation D / 4 = (D / 6) - 1 to find the value of D.

D / 4 = (D / 6) - 1
Multiply both sides by 12 to eliminate the denominators:
3D = 2D - 12
Subtract 2D from both sides:
D = -12

The distance D is negative, which doesn't make sense in this context. It means that the second pedestrian will never catch up to the first pedestrian.

Conclusion

Based on the given information, the second pedestrian will not be able to catch up to the first pedestrian.