Question

Из двух пунктов,расстояние между которыми 240 км,одновременно отправились велосипедист и мотоциклист. .Велосипедист двигался со скоростью 15 км/ч,а мотоциклист-в 3 раза быстрее. Через сколько часов они встретятся?

Answer 1

Скорость мотоциклиста:

15 * 3 = 45 (км/ч)

Скорость сближения объектов:

15 + 45 = 60 (км/ч)

Объекты встретятся через :

t=s:v=240 : 60 = 4 (ч)

Ответ: через 4 часа они встретятся.

______________________

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Answer 2

Ответ:

1) 15 * 3 = 45 ( км/ч) - скорость мотоциклиста ;

2) 15 + 45 = 60 (км/ч) - скорость сближения ;

3) 240 : 60 = 4 ( ч ) - время .

Ответ : через 4 часа .

Answer 3

Problem Analysis

We are given that a cyclist and a motorcyclist start simultaneously from two points that are 240 km apart. The cyclist is moving at a speed of 15 km/h, while the motorcyclist is moving at a speed three times faster. We need to determine how many hours it will take for them to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. We can calculate the time it takes for both the cyclist and the motorcyclist to cover the distance between them and find the time at which they meet.

Let's calculate the time it takes for the cyclist and the motorcyclist to cover the distance between them.

Calculation

The distance between the cyclist and the motorcyclist is 240 km.

The cyclist's speed is 15 km/h. Using the formula, we can calculate the time it takes for the cyclist to cover the distance: time_cyclist = distance / speed = 240 km / 15 km/h = 16 hours.

The motorcyclist's speed is three times faster than the cyclist's speed, which is 15 km/h * 3 = 45 km/h. Using the formula, we can calculate the time it takes for the motorcyclist to cover the distance: time_motorcyclist = distance / speed = 240 km / 45 km/h = 5.33 hours.

Since the motorcyclist is faster, they will meet the cyclist before the cyclist reaches the meeting point. Therefore, we can conclude that the cyclist and the motorcyclist will meet after approximately 5.33 hours.

Answer

The cyclist and the motorcyclist will meet after approximately 5.33 hours.

Please let me know if I can help you with anything else.