A can complete a work in $15$ days and B can complete it in $10$ days. In how many days can they complete it together?
Practice this question from Chapter Mock 7: Time and Work, Pipe and Cistern, with options and an explanation.
Question
A can complete a work in $15$ days and B can complete it in $10$ days. In how many days can they complete it together?
Option A
5 days
Option B — Correct answer
6 days
Correct choice.
Option C
7.5 days
Option D
8 days
Explanation
Combined rate $=\frac1{15}+\frac1{10}=\frac16$. So time $=6$ days.