Question

Две черепахи одновременно поползли навстречу друг другу.Расстояние между ними было 456 м.Скорость одной - 12 м/мин,другой -7 м/мин. Через сколько минут между черепахами будет 114 м ? Через сколько минут они встретятся?

Answer 1

12*3=36(м) - проползла вторая.
12+36=48(м) было расстояние,проползли обе.
Ответ:48м.

Answer 2

Problem Analysis

We have two turtles crawling towards each other. The distance between them is 456 m. The first turtle crawls at a speed of 12 m/min, and the second turtle crawls at a speed of 7 m/min. We need to find out how many minutes it will take for the distance between them to be 114 m, as well as the total time it will take for them to meet.

Solution

Let's break down the problem step by step:

1. Find the time it takes for the distance between the turtles to be 114 m. 2. Find the total time it takes for the turtles to meet.

Step 1: Time to Reach 114 m

To find the time it takes for the distance between the turtles to be 114 m, we can use the formula:

Time = Distance / Speed

For the first turtle: Distance = 456 m - 114 m = 342 m Speed = 12 m/min

For the second turtle: Distance = 114 m Speed = 7 m/min

Let's calculate the time for each turtle:

For the first turtle: Time = 342 m / 12 m/min = 28.5 min

For the second turtle: Time = 114 m / 7 m/min = 16.29 min

Therefore, it will take approximately 28.5 minutes for the distance between the turtles to be 114 m.

Step 2: Total Time to Meet

To find the total time it takes for the turtles to meet, we can take the maximum of the two times calculated in Step 1. This is because the turtles will meet when the slower turtle reaches the 114 m mark.

Total Time = max(Time for the first turtle, Time for the second turtle)

Total Time = max(28.5 min, 16.29 min) ≈ 28.5 min

Therefore, it will take approximately 28.5 minutes for the turtles to meet.

Answer

To summarize: - The time it takes for the distance between the turtles to be 114 m is approximately 28.5 minutes. - The total time it takes for the turtles to meet is approximately 28.5 minutes.

Please note that these calculations are approximate and assume constant speeds for the turtles.