Cookiebaly Cookiebaly

03-08-2018
Mathematics

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An experienced bricklayer can construct a small wall in 4 hours. An apprentice can complete the job in 12 hours. Find how long it takes if they work together.

It would take _ hours for an experienced bricklayer and apprentice to construct a small wall together.
(Type an integer or a decimal.)

Respuesta :

mathecoach mathecoach

03-08-2018

It would take

1/(1/4 + 1/12) = 3 hours ...

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