New in version 1.1.
Multiply pair by rational multiplier and reduce factors:
abjad> from abjad.tools import durationtools
abjad> durationtools.multiply_duration_pair_and_reduce_factors((4, 8), Fraction(2, 3))
(4, 12)
Intended for certain types of meter multiplication.
Return integer pair.
Changed in version 2.0: renamed durationtools.pair_multiply_reduce_factors() to durationtools.multiply_duration_pair_and_reduce_factors().