Mayank can do 50% more work than Shishu in the same time. Shishu alone can do a piece of work in 30 hours. Shishu starts working and he had already worked for 12 hours when Mayank joins him. How many hours should Shishu and Mayank work together to complete the remaining work?
a) 6 b) 12 c) 4.8 d) 9.6

• ans is 6hrs
  bcoz.. shishu 1 hr work is 1/30
  mayank 1 hr work is 1/15
  in 12 hrs ,12/30=2/5th of work is cmpleted, the remaining work is 3/5
  1/30+1/15=1/10
  so they both complete the whole work in 10 hrs
  3/5 th part in 3/5*10=6 hrs
  
• 12 years agoHelpfull: Yes(5) No(15)
• sishu work is 30
  mayank work is 15 bcoz 15% of sishu
  total parts of work is 30 (LCM of 15,30)
  so sishu 1hr work is 30/30=1
  mayank 1hrwork is 15/30-2
  already 12 hours work is over so remaining works is 18 (30-12)
  both together complete 3work in 1hr
  so 18/3=6
  Ans is 6
• 12 years agoHelpfull: Yes(2) No(8)