Reggie can line a football field in 120 minutes. Rosalinda can line a football field in 80 minutes. If they work together, how many minutes does it take them to line a football field?

Question

prince1342 · Answer

40 minutes
 48 minutes
 200 minutes
 240 minutes

luffingsails · Answer

This is sort of a unitless question. Assume that they need to line 100 yards.

So, Reggie's rate is 100 yards/120 minutes = 5yards/6 minutes
Rosalinda's rate is 100 yards/80 minutes = 5 yards / 4 minutes

If they work together to line 100 yards, how long does it take them.

5/6 (X) + 5/4(X) = 100 yards
10/12(X) + 15/12(X) = 100 yards
25/12(X) = 100 yards
25(X) = 1200
(X) = 48

So, the time is 48 minutes.

prince1342 · Answer

thank you so much

luffingsails · Answer

Welcome!