Twin brothers, Billy and Bobby, can mow their grandparent's lawn in 76 minutes. Billy could mow the lawn by himself in 15 minutes less time than it would take Bobby. How long would it take Bobby to mow the lawn by himself?

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Twin brothers, Billy and Bobby, can mow their grandparent's lawn in 76 minutes. Billy could mow the lawn by himself in 15 minutes less time than it would take Bobby. How long would it take Bobby to mow the lawn by himself?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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T(bob) + T(bill) = 76 is what im thinking
bob-15 + bob = 76
2bob = 91 bob = 91/2 = 45.5 maybe

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that almost feels right; almost ...
the by himself part is not being taken into account
amistre 64 ineed ur help
I dont know c++
oh....ok...:(
if we had the set up the we know bob and bill alone we could get to time together .... so im gonna have to look backwards at this :)
bob = time (b) alone bill = time (b -15) alone \[\frac{1}{b}+\frac{1}{b-15}=\frac{1}{76}\] \[\frac{b-15}{b(b-15)}+\frac{b}{b(b-15)}=\frac{1}{76}\] \[\frac{b-15+b}{b(b-15)}=\frac{1}{76}\] \[\frac{b(b-15)}{b-15+b}=76\] \[\frac{b^2-15b}{2b-15}=76\] \[b^2-15b=76(2b-15)\] \[b^2-15b-76(2b-15)=0\] \[b^2-15b-152b+1140=0\] \[b^2-167b+1140=0\] maybe?
b = about 160 or 8; so id go with 160 minutes as a gut thing if:\[\frac{1}{160}+\frac{1}{160-15}=\frac{1}{76}\]then it should be good
http://www.wolframalpha.com/input/?i=1%2F160+%2B+1%2F%28160-15%29+-+1%2F76 yeah, im going with that, or close to it

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