Q:

P, Q and R alone can complete a piece of work in 24, 36 and 18 days respectively. P started working, after 2 days R joins with them and Q joins with them after another 2 days, then find the no of days P, Q and R worked together.

• 1
  $$ {5{2\over 9}\ days}$$
• 2
  $$ {6{2\over 9}\ days}$$
• 3
  $$ {4{3\over 5}\ days}$$
• 4
  $$ {6{4\over 9}\ days}$$
• 5
  None of these