If A can copy 50 pages in 10 hours and A and B together can copy 70 pages in 10 hours, how much time does B takes to copy 26 pages?

• If A can copy 50 pages in 10 hour, Then
  
  A = 50,
  
  If A + B can copy 70 pages in 10 hour, then say
  
  A + B = 70
  
  B = 70 - 50 (Substituted A's value since A can copy 50 pages in 10 hour)
  
  B = 20 but for 10 hours.
  
  20 pages = 10 hour
  
  1 page = 10/20 => 0.5hr
  
  26 pages = (26 * 0.5) or (26 * 1/2)
  
  26 pages = 13 hour
  
• 11 years agoHelpfull: Yes(22) No(0)
• 13 hours
  after all calculation
• 11 years agoHelpfull: Yes(2) No(0)
• A copy 50 pages in 10 hours.
  A and B copy 70 pages in 10 hours.
  it means B copies 20 pages in 10 hours.
  then time for 26 pages for B..???
  20 pages = 10 hours
  6 pages = 6*10/20
  =3 hours.
  then total time taken by B for 26 hours is 10+3= 13hours
• 10 years agoHelpfull: Yes(2) No(0)
• ans 13
  a 1hr 50/10=5page
  a&b 1 hr =70/10=7
  b 1hr 7-5=2 page
  now b 26hr me 26/2=13 page
• 9 years agoHelpfull: Yes(1) No(0)
• 13 pages.
  
  A :
  10 hrs = 50 pages.
  1hr = 5 pages.
  
  A+B :
  10hrs = 70 pages.
  1hr = 7 pages.
  
  thus only B can type : 7-5 = 2 pages.
  
  2 pages typed by B in 1 hour.
  
  26 pages typed by B in 26/2 = 13 hours (Answer)
• 9 years agoHelpfull: Yes(1) No(0)
• 10hrs=50 Pages
  1 hr=50/10=5p
  (A+B )10 hr=70 p
  1 hr=7p
  A+B=7( in 1 hr)
  if A=5 then B=2;
  if B copy 2 pages per hr then
  1hr=2pages
  1*13=2*13(26)
  ANS :13
• 7 years agoHelpfull: Yes(0) No(0)