Question

Два паучка одновременно полетели навстречу друг другу на своих паутинках. Один летел со скоростью 30м/мин, а другого-40 м/мин. Через сколько часов они встретились, если первоначальное расстояние между ними было 140 м?

Answer 1

30+40= 70 (м/мин) скорость сближения
140:70= 2 ( минуты)  время, через которое паучки встретились
2 минуты = 2/60 часа = 1/30 часа
Ответ:  через 1/30 часа паучки встретились.

Answer 2

Problem Analysis

Two spiders are flying towards each other on their webs. One spider is flying at a speed of 30 m/min, while the other spider is flying at a speed of 40 m/min. The initial distance between them is 140 m. We need to determine how many hours it takes for them to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. We'll calculate the time it takes for each spider to reach the meeting point and then find the minimum time.

Let's calculate the time it takes for the first spider to reach the meeting point: - Distance: 140 m - Speed: 30 m/min - Time = 140 m / 30 m/min

Let's calculate the time it takes for the second spider to reach the meeting point: - Distance: 140 m - Speed: 40 m/min - Time = 140 m / 40 m/min

To find the minimum time, we compare the two times and choose the smaller one.

Calculation

- Time for the first spider: 140 m / 30 m/min = 4.67 min - Time for the second spider: 140 m / 40 m/min = 3.5 min

Since the second spider takes less time to reach the meeting point, we can conclude that the spiders will meet after approximately 3.5 minutes.

Answer

The two spiders will meet approximately after 3.5 minutes.