Question

одна бригада может выполнить задание за 10 ч, а вторая-за 15 ч. Сначала первая бригада отработала 2 ч, а затем вторая бригада-6 ч. После чего обе бригады выполнили оставшуюся часть работы. За какое время это произошло? ( Время выразите в часах и минутах.)

Answer 1

За шесть дней это прошло

Answer 2

Problem Analysis

We are given two brigades that can complete a task in 10 hours and 15 hours respectively. The first brigade worked for 2 hours and the second brigade worked for 6 hours. We need to determine how much time it took for both brigades to complete the remaining work.

Solution

Let's assume that the amount of work done by the first brigade in 1 hour is x and the amount of work done by the second brigade in 1 hour is y.

From the given information, we can set up the following equations:

Equation 1: The first brigade worked for 2 hours and