Mark can clean his father's office in 30 minutes. his younger sister lynn can clean the office in 40 minutes. how long will it take if they come together and clean the office

]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle