Question 203159
Since Steven can mix 20 drinks in 5 minutes, then he can mix 4 (20/5) drinks in 1 minute


Since Sue can mix 20 drinks in 10 minutes, then she can mix 2 (20/10) drinks in 1 minute


Since Jake can mix 20 drinks in 15 minutes, then he can mix {{{4/3}}} ({{{20/15}}}) drinks in 1 minute


Working together, the 3 can mix {{{22/3}}} drinks in 1 minute, and 20 drinks in {{{60/22}}} mins, or 2.73 minutes, or {{{highlight_green(2 minutes 44 seconds)}}}.