Question

Расстояние между двумя городами 60 км из них одновременно в одном направлении выехали два велосипедиста скорость одного велосипедиста 12км /ч а другого следующего за первым 15км/ч через какое время второй велосипедист догонит первого?

Answer 1

1) 15-12=3 км/ч - скорость, с которой второй догоняет первого (на 3 км сокращается расстояние между велосипедистами за каждый час)

2) 60:3=20 часов

Ответ: 20 

Answer 2

Problem Analysis

We are given that two cyclists start simultaneously from the same point, with one cyclist traveling at a speed of 12 km/h and the other cyclist traveling at a speed of 15 km/h. We need to determine how long it will take for the second cyclist to catch up to the first cyclist.

Solution

To solve this problem, we can use the formula:

time = distance / speed

Let's denote the time it takes for the second cyclist to catch up to the first cyclist as t. We can set up the following equation:

60 km = (15 km/h - 12 km/h) * t

Simplifying the equation, we get:

60 km = 3 km/h * t

Dividing both sides of the equation by 3 km/h, we find:

t = 20 hours

Therefore, it will take the second cyclist 20 hours to catch up to the first cyclist.

Answer

The second cyclist will catch up to the first cyclist after 20 hours.

Explanation

The distance between the two cities is given as 60 km. The first cyclist is traveling at a speed of 12 km/h, while the second cyclist is traveling at a speed of 15 km/h. Since the second cyclist is traveling faster than the first cyclist, they will eventually catch up.

Using the formula time = distance / speed, we can calculate the time it takes for the second cyclist to catch up to the first cyclist. Plugging in the values, we have:

time = 60 km / (15 km/h - 12 km/h) = 60 km / 3 km/h = 20 hours

Therefore, the second cyclist will catch up to the first cyclist after 20 hours.