Q. Narendra can copy 50 pages in 10 hrs.Narenda and Prasad together can copy 300 pages in 40 hours. In how much time prasad can copy 30 pages.

• Narendra 's 1 hr copy page=50/10=5 page
  (Narendra+prasad)'s 1 hr copy page=300/40=7.5 page
  from above prasad's 1 hr copy page= 2.5 page
  so time taken in 30 page's copy =(30/2.5)
  =>Ans:-12 hrs
  
• 11 years agoHelpfull: Yes(46) No(0)
• ans 12hrs
  (50/10)+(30/x)=300/40
  x=12hrs
• 11 years agoHelpfull: Yes(6) No(0)
• ans: 12 hours
  in 1 hour narendra can copy 5 pages.
  let in 1 hour prasad can copy x pages.
  from the given information, 5*40 + x*40 = 300
  from this , x*4 = 10 i.e in hours, prasad can copy 10 pages, to for 30 pages he need 4*3 = 12 hours of time.
• 11 years agoHelpfull: Yes(5) No(0)
• Initially narendra can copy 50 pages in 10hrs
  means in 1 hr he can copy 50/10=5 pages
  narendra and prasad can copy 300 pages in 40 hrs
  means in 1 hr they can copy 300/40=7.5 pages
  7.5 can be written as 5+2.5
  here already we know that narendra can copy 5 pages in 1 hr ..so reamining 2.5 will be copied by prasad in 1 hr..
  1 hr -->2.5 pages
  ?-->30 pages
  30*1/2.5=12 hrs.
• 10 years agoHelpfull: Yes(1) No(0)
• in 12 hours
  
• 10 years agoHelpfull: Yes(1) No(0)
• 5pg 1hr
  15/2pgs 1hr
  5+x=15/2
  x=15/2-5
  thus x=5/2
• 10 years agoHelpfull: Yes(0) No(3)
• narendra 50 in 10hrs
  narendra and prasad 300 in 40 hrs here narendra can write 200 pages in 40 hrs and remaining 100 pages prasad can write in 40hrs so,
  1 page=40/100 hrs/page
  1 page=0.4 hrs/page
  for 30 pages 30*0.4=12
  ANS:-12hrs
• 10 years agoHelpfull: Yes(0) No(1)
• narendra copy in 40 hours=50*40/10=200 pages
  left 100 pages copy by prasad in 40 hours
  so prasad copy 30 pages in 12 hour (40*30/100)
• 10 years agoHelpfull: Yes(0) No(0)