SOLUTION: if lisa types a paper in 5 hours and lisa and bill together type the same paper in 2 hours how long would it take for bill to type the same paper alone?

Question 287626: if lisa types a paper in 5 hours
and lisa and bill together type the same paper in 2 hours
how long would it take for bill to type the same paper alone?
Answer by Grinnell(63) (Show Source): You can put this solution on YOUR website!
What can be done in 1 hour?
Lisa can type 1/5 of the paper in hour.
Bill Can type 1/B of the paper in 1 hour.
TOGETHER they can type 1/2 the paper in one hour. Soooo
1/5+1/B=1/2 (do the math!)
B=10/3 BUT let's check this!
1/5+ 1/10/3=3/10 1/5+3/10=2/10+3/10=5/10=1/2
The answer is three hours and 20 minutes
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