A can do a piece of work in 20 days and B can do the same work in 15 days.How long will they take to finish the work, if both work together?

13 \frac{1}{2} D a y s

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10 days

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8 \frac{4}{7} D a y s

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17 \frac{1}{2} D a y s

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Solution

The correct option is C $8 \frac{4}{7} D a y s$
A can do in = 20 day
B can do in- 15 day
Both can do in= $\frac{(20) (15)}{20 + 15} (\frac{x y}{x + y})$
$= \frac{300}{35} = \frac{60}{7} = 8 \frac{4}{7} d a y s$

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A can do a piece of work in 20 days and B can do the same work in 15 days.How long will they take to finish the work, if both work together?

The correct option is C 847DaysA can do in = 20 dayB can do in- 15 dayBoth can do in=(20)(15)20+15(xyx+y)=30035=607=847days

The correct option is C $8 \frac{4}{7} D a y s$
A can do in = 20 day
B can do in- 15 day
Both can do in= $\frac{(20) (15)}{20 + 15} (\frac{x y}{x + y})$
$= \frac{300}{35} = \frac{60}{7} = 8 \frac{4}{7} d a y s$