math
posted by Ann .
Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car?

1/both = 1/megan + 1/sam
1/12 = 1/21 + 1/s
s = 28 
I like chicken
posted by Ann .
Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car?
1/both = 1/megan + 1/sam
1/12 = 1/21 + 1/s
s = 28
I like chicken