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How long will it be before there is 1 full box of leotards cut and waiting for their side seams to be stitched?

This the complete problem I need help with:
Albert and Po work in a factory that makes leotards. Albert cuts out the material, and Po stitches the side seams. Albert can cut the parts for 1 box of leotards in 9 hours, and Po can stitch the side seams for 1 box of leotards in 27 hours (including any breaks). If Albert and Po start work at the same time, how long will it be before there is 1 full box of leotards cut and waiting for their side seams to be stitched?
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1 Answer

1. Regular approach:
Let t be the length of the time to be found.
(1/9)t = (1/27)t + 1
Solve for t,
t = 13.5 hours
 
2. Mental math approach:
Since the difference in working rate is (1/9-1/27) = 2/27, it takes 27/2 = 13.5 hours before 1 full box of leotards cut and waiting for their side seams to be stitched.