A copying machine "P" can copy 135 pages in 9 minutes, P and Q together can copy 300 pages in 12 minutes. In what time Q can copy 80 pages?

• 8 min.
  
  P, 1 min.=135/9= 15 pages
  (P+Q), 1 min= 300/12= 25 pages
  Q, 1 min.=25-15= 10 pages
  So for 80 pages Q will take 80/10= 8 min.
• 10 years agoHelpfull: Yes(7) No(0)
• P copying 135 pages in 9 minutes.
  so in 1 minute P copying=135/9=15 pages
  P and Q both copying 300 pages in 12 minute.
  so in 12 minute P coying the 12*15=180 pages.
  so Q copying alone=300-180=120 pages.
  according to question Q takes 12 minute for copying the pages.
  so for 1 minute 120/12=10 pages.
  because for 10 pages takes 1 minute
  so 80 pages it's takes 8 minute
  so ans is 8 minute.
  
• 10 years agoHelpfull: Yes(1) No(0)
• p can copy 135 pages in 9 minute ..
  or can copy 135/9 = 15 pages in 1 min
  similarly p and q can copy 300/12 = 25 pages in 1 minute
  so q can copy 25-15 = 10 pages in 1 miute
  so it can copy 80 pages in 8 minute
• 10 years agoHelpfull: Yes(0) No(0)
• suppose x is the rate that Q m/c can copy pages in min
  so
  300=(135/9)*12+12x
  then x=(300-180)/12=10
  so Q will take 80/10=8 mins
• 10 years agoHelpfull: Yes(0) No(0)
• p = 135 pages - 15pages/minute
  p and q -300 pages - 25pages/min
  q - 80 pages - -10 pages /min(25-15)
  so for q,
  80=10x
  x=8
• 10 years agoHelpfull: Yes(0) No(0)
• In one minute P will be print only 15 page.(15*9=135)
  hence p+q =300-180=120 which is printed by q within 12 minute .But q will be printed only 10 page within the one minute hence it will take 8 minute to print 80 pages.
• 10 years agoHelpfull: Yes(0) No(0)
• 800minutes
• 10 years agoHelpfull: Yes(0) No(0)
• 8 minutes
  in 12 minutes ,p can copy 180 pages , remaining 120 copied by q
  80 pages can be copied in 8 minutes
• 10 years agoHelpfull: Yes(0) No(0)
• in 8 minutes it prints 80 pages
  
• 10 years agoHelpfull: Yes(0) No(0)
• 135 pg ------------9mins
  =>1min----15pg by P
  300 pg ------------ 12 mins
  =>1min----25 pg by both
  so,15+Q=25
  Q=10pg in 1min..
  80pg take 8*1 mins=8mins...
• 10 years agoHelpfull: Yes(0) No(0)
• p' s 1 min work= 135/9=15 pages /min
  so p' s 12 min work=15*12=180 pages
  Q' s 12 min work=300-180 =120 pages
  so Q 's 1 min work =120 /12=10 pages /min
  now 80 pages are in 80 /10 = 8 min Answer
• 9 years agoHelpfull: Yes(0) No(0)