Question

Blake can paint a room in 9 hours, Ned can paint the same room in 6 hours, how long to paint the room together

Answer 1

Work done by Blake = 1/9; Work done by Ned = 1/6; Total work done by both of them together is given by 1/6 +1/6 = 3+2/18 = 5/18; So, the time taken by both of them if they work together is given by: 18/5 =3 3/5 hours.