Need with this continuity problem.

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Quadrilateral ghij has coordinates g(5, 1), h(4, -3), i(6, -1), and j(2, 1). if the quadrilateral is reflected over the line y = x, what are the coordinates of h'?

Aline passes through the point (9,-7) and has a slope of 4/3 write an equation in point-slope form for this line. first to answer correctly gets brainleist