Posted by john on Monday, July 23, 2012 at 12:11am.
Add the two hours together.
Brooke's answer makes no sense
Frank's rate = 1/4
James rate = 1/6
combined rate = 1/4 + 1/6 = 5/12
time at combined rate = 1/(5/12)
= 12/5
= 2.4 hours
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