Evening shift

While working the evening shift, Officer K took 8 hours to complete a task at his work station and
Officer M took 10 hours to complete the same task at his work station. How many hours would it take
Officer K and Officer M to complete the same task working together, each working at his own work
station?

Correct result:

t =  4.4444 h

Solution:

$t={\displaystyle \frac{1}{{\displaystyle \frac{1}{8}}+{\displaystyle \frac{1}{10}}}}={\displaystyle \frac{40}{9}}=4.4444\text{ h}$

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