A man can do a piece of work in $5$ days, but with the help of his son, he can do it in $3$ days. In what time can the son do it alone?

7.5

days

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8.5

days

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9.5

days

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11.5

days

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Solution

The correct option is A $7.5$ days
$S o n^{'} s 1 d a y^{'} s w o r k = (\frac{1}{3} - \frac{1}{5}) = \frac{2}{15} .$
$∴ T h e s o n a l o n e c a n d o t h e w o r k i n \frac{15}{2} = 7.5 d a y s$

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