Q:

A can do as much work as B and C together can do. A and B can together do a piece of work in 9 hours 36 minutes and C can do it in 48 hours. The time (in hours) that B needs to do the work alone, is: 

• 1
  18 hrs
• 2
  24 hrs
• 3
  30 hrs
• 4
  12 hrs