Question 1159053
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L can do one in 8 seconds, so she can do *[tex \Large \frac{1}{8}] of one in one second.  Likewise, B can do *[tex \Large \frac{1}{10}] of one in one second.  Together, they can do:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{1}{8}\ +\ \frac{1}{10}\ =\ \frac{9}{40}]


of one in one second.  So that means together they take *[tex \Large \frac{40}{9}] seconds to do one.


They would finish 36 in *[tex \Large \frac{40}{9}\ \times\ 36] seconds.  You can finish the arithmetic.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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