Question

Бак наполнится водой через 2 трубы за 2 часа. через 1 трубу бак наполнится за 3 часа. за сколько времени 2/3 объёма бака наполнятся водой через вторую трубу

Answer 1

1) 1/2 - 1/3 = 3/6 - 2/6 = 1/6 наполняет вторая труба за 1 час
2) 2/3 : 1/6 = 2/3 * 6/1 = 2/1 * 2/1 = 4 часа за столько наполнит вторая труба 2/3 бака

Answer 2

Problem Statement

You have a tank that can be filled with water through two pipes. Pipe A can fill the tank in 2 hours, and pipe B can fill the tank in 3 hours. You want to know how long it will take to fill 2/3 of the tank using pipe B.

Solution

To find the time it takes to fill 2/3 of the tank using pipe B, we need to calculate the time it takes to fill the entire tank using pipe B and then multiply it by 2/3.

Let's start by finding the time it takes to fill the entire tank using pipe B. We know that pipe B can fill the tank in 3 hours. Therefore, the rate at which pipe B fills the tank is 1/3 of the tank per hour.

Now, let's calculate the time it takes to fill 2/3 of the tank using pipe B. Since the rate at which pipe B fills the tank is 1/3 of the tank per hour, it will take 2/3 of the time it takes to fill the entire tank using pipe B.

To calculate the time, we can use the formula:

Time = (2/3) * (Time to fill the entire tank using pipe B)

Let's calculate the time:

Time = (2/3) * (3 hours)

Time = 2 hours

Therefore, it will take 2 hours to fill 2/3 of the tank using pipe B.