Question

Двое рабочих делают какую-то работу вместе за 8часов. Если 1ый поработает 12 часов , тогда остальную часть работы второй сделает за 5 часов . За сколько часов сделает в работу 2ой рабочий ? Помогите пожалуйста срочно!!!!

Answer 1

Ответ:

Пусть первый делает всю работу за x часов, а второй за y, тогда

8/x+8/y=1 (1)

12/x+5/y=1 (2)

И надо найти y

Умножим (1) на 1.5:

12/x+12/y=1.5 (3)

Отнимем от (3) (2)

12/y-5/y=1.5-1

7/y=0.5

y=14

Пошаговое объяснение:

Answer 2

Problem Analysis

We have two workers who are working together to complete a task in 8 hours. If the first worker works for 12 hours, the second worker will be able to complete the remaining work in 5 hours. We need to determine how many hours it will take for the second worker to complete the entire task.

Solution

Let's assume that the amount of work required to complete the task is represented by the variable "W". Since the two workers can complete the task together in 8 hours, their combined work rate is equal to W/8.

According to the given information, if the first worker works for 12 hours, the second worker will be able to complete the remaining work in 5 hours. This means that the first worker completes 12/8 = 1.5 times the amount of work that the second worker can complete in 1 hour.

To find the work rate of the second worker, we can set up the following equation:

1.5 * (W/8) = W/x

Where "x" represents the number of hours it will take for the second worker to complete the entire task.

To solve for "x", we can cross-multiply and simplify the equation:

1.5 * (W/8) = W/x

1.5x = 8W

x = 8W/1.5

Therefore, the second worker will be able to complete the entire task in 8W/1.5 hours.

Answer

The second worker will be able to complete the entire task in 8W/1.5 hours.