Question

One crew can seal a parking lot in 6 hours and another in 8 hours. How long will it take to seal the parking lot if the two crews work together?

Answer 1

2 hours

Explanation:

Given that the slow crew does the job in x/8 hours and fast in x/6

Equation:

x/6 + x/8 = 1 <------------1 because there is one job to be done

8x + 6x = 48

24x = 48

x = 2

It will take both groups working together 2 hours