\version "2.18.2"
\paper { ragged-right = ##f }
\score {
    \new PianoStaff <<
        \new Staff { \time 3/4 \repeat unfold 3 { c''16 c'' c'' c'' } }
        \new Staff { \repeat unfold 3 { \tuplet 3/2 { c''16 c'' c'' c'' c'' c'' } } }
    >>
    \layout{ }
}