Question

В 8 часов расстояние между 2 катерами , плывущими навстречу друг другу,было 250 км. Скорости катеров 25 км/ч и 35 км/ч.Встретятся ли они до 12 часов того же дня? Через сколько часов произойдёт встреча?(Ответ вырази сначала в часах, а затем в часа и минутах)Помогите плии, а то попа будет!!

Answer 1

12 - 8 = 4 ч - время в пути
25 * 4 = 100 м - проплыл первый за 4 часа
35 * 4 = 140 км  -проплыл второй за 4 часа
100 + 140 = 240 км проплывут  оба -до 12ч - не встретятся 
35 + 25 = 60 км/ч - общая скорость 
250 : 60 = 4, 1 часа  -время до встречи
Ответ: До 12 часов не встретятся,  встреча  произойдёт через 4ч.10 мин.

Answer 2

Problem Analysis

We are given two boats traveling towards each other. The distance between them at 8 o'clock is 250 km, and the speeds of the boats are 25 km/h and 35 km/h. We need to determine if they will meet before 12 o'clock and calculate the time it takes for them to meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. We will calculate the time it takes for each boat to cover the distance between them and compare the results.

Let's calculate the time it takes for the first boat to cover the distance: - Distance: 250 km - Speed: 25 km/h - Time = 250 km / 25 km/h = 10 hours

Now, let's calculate the time it takes for the second boat to cover the distance: - Distance: 250 km - Speed: 35 km/h - Time = 250 km / 35 km/h = 7.14 hours (rounded to two decimal places)

Since the second boat takes less time to cover the distance, we can conclude that they will meet before 12 o'clock.

To calculate the exact time of their meeting, we need to subtract the time it took for the second boat from 12 o'clock: - 12 o'clock - 7.14 hours = 4.86 hours

Converting 4.86 hours to hours and minutes, we get: - 4 hours and 0.86 hours * 60 minutes/hour = 4 hours and 51.6 minutes (rounded to the nearest minute)

Therefore, the two boats will meet approximately 4 hours and 51 minutes after 8 o'clock.

Answer

The two boats will meet before 12 o'clock on the same day. The meeting will occur approximately 4 hours and 51 minutes after 8 o'clock.