Question

If Marie were to paint her living room alone, it would take 7 hours. Her sister Barbara could do the job in 8 hours. How many hours would it take them working together? Express your answer as a fraction reduced to lowest terms, if needed.

Answer 1

Answer:

$\sf\longmapsto \: 3.73 hours$

Step-by-step explanation:

$\sf\longmapsto \: \frac{1}{7 } + \frac{1}{8}$

$\sf\longmapsto \: \frac{15}{56}$

Now, Reciprocal–

$\sf\longmapsto \: \frac{56}{15}$

$\sf\longmapsto \: 3.73 hours$