Question

Two brigades had to build a house. The first brigade works alone and builds the house in 15days. The second brigade builds it in 30days. How long will it take to build the house when both brigades work together?

Answer 1

Answer:

Step-by-step explanation:

A simple shortcut

(15×30)÷(15+30)=10days

Let total work will be 30 units

1st brigade 1 day work will be 2 unit

2nd brigade 1day work will be 1 unit

Total unit done by both brigade in 1day is 3 unit so in 10 days total work will be done.