Question

A can do a piece of work in 15 days while B can do it in 10 days. how long will they take together to do it?

• A. $9$ days
• B. $4$ days
• C. $5$ days
• D. $6$ days

Answer 1

Answer: (D)

$6$ days

$A$ can do peice of work in $15$ days.

$B$ can do peice of work in $10$ days.

then together they can do it in $x$ days.

$\frac{1}{x}=\frac{1}{15}+\frac{1}{10}$

$\frac{1}{x}=\frac{3+2}{30}=\frac{1}{6}$

$x=6$ days. together they can do work in $6$ days.