It takes Spot 2 hours to paint a fence and Steven 4 hours to paint the same fence. If they work together, how long will it take them to paint the fence?
Spot paints 1/2 of a fence in an hour
Steven paints 1/4 of a fence in an hour
Together, in an hour, they paint 1/2 + 1/4 of a fence in an hour
1/2 = 2/4, so we have 2/4 + 1/4 = 3/4 of a fence in an hour
Meaning they take another 20 minutes to pain the last 1/4 of the fence
1 hour + 20 minutes is the total time it takes
Spot paints 1/2 of a fence in an hour
Steven paints 1/4 of a fence in an hour
Together, in an hour, they paint 1/2 + 1/4 of a fence in an hour
1/2 = 2/4, so we have 2/4 + 1/4 = 3/4 of a fence in an hour
Meaning they take another 20 minutes to pain the last 1/4 of the fence
1 hour + 20 minutes is the total time it takes