If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
The answer is 2 hours and 24 minutes. How would one do the math to figure this out?
Sally uses 4 hours (240 min) to paint a house. John uses 6 hours (360 min) to paint a house. Hence, in one min, they have painted (1/240 + 1/360) of the house. Hence, they used a total of 2 hours and 24 min (144 min) to paint the house.If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
The answer is 2 hours and 24 minutes. How would one do the math to figure this out?