Homework Help: math

Posted by Ann on Wednesday, July 4, 2012 at 11:35pm.

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?

math - Steve, Thursday, July 5, 2012 at 10:32am
1/both = 1/megan + 1/sam
1/12 = 1/21 + 1/s
s = 28
math - Jim Bonacci, Wednesday, January 16, 2013 at 4:18pm
I like chicken

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