Question

For Tom, it takes 11 hours to restock the store. However, Keith takes 12
hours to do this job. If working together, how long would they take?

Answer 1

ANSWER: 5 17/23 hrs (5.7391...)

How?
T = 11 hrs
K = 12 hrs
Together = X

1/11x + 1/12x = 1/x

11x/132 + 12x/132 = 132/132

11x x 12x = 23x —> 23x = 132 (divide 132 by 23x)

= 5.73913043 (5 17/23)