A can copy 50 pages in 10 hrs while A and B copy 70 pages in 10 hrs.Then how many hrs required for B to copy 26 pages?

• A in 1hr copies (50/10)or 5 pages. (A+B) in 1hr copies (70/10) or 7 pages.
  therefore, B in 1hr copies 2 pages. so B copies 26 pages in (26/2) or 13hrs.
• 9 years agoHelpfull: Yes(24) No(0)
• A can copy =50/10=5pages/hr
  A+B can copy=70/10=7pages/hr
  Hence,
  (A+B)-A=(7-5)pages/hr
  or,B=2pages/hr
  So,B wil required =26/2=13hrs. to complete copy of 26 pages
• 9 years agoHelpfull: Yes(3) No(0)
• B can copy in 10 hr=A and B together- A
  70-50=20
  Since 20 pages copied in 10 hr
  So 26 =20/10*26=13
• 9 years agoHelpfull: Yes(1) No(0)
• in 10 hrs A can copy 50 pages
  Both A&B can copy in 10 hrs 70 pages
  i.e B can copy 20 pages in 10hrs
  similarly for 26 pages he requires 13hrs :)
  
• 9 years agoHelpfull: Yes(1) No(0)
• a can copy 5pages in 1 hr(50/10),a+b can copy 7 pages in 1 hr.hence b can copy 2 pages in 1 hr..total 26 pages can be copied in 26/2=13hr
• 9 years agoHelpfull: Yes(1) No(0)
• A can copy 50 pages in 10 hrs, so 1 page can be copied in (10/50)=(1/5)hr.
  
  A and B can copy 70 pages in 10 hrs, so 1 page can be copied by A & B in (10/70)=(1/7)hr.
  
  which means (1/A)+(1/B)=7hr. solve using A=(1/5)hr and then B=(1/2).
  B can copy one page in (1/2)hr. so 26 pages can be copied in (26*1/2)hrs=13hrs
• 9 years agoHelpfull: Yes(1) No(0)
• 13 hrs will be the ans..
  rate of A alone is 50/10.
  let rate of B be x for 10 hrs
  if both work together then 10(50/10 + x/10)=70
  x=20, so in 10hrs B copy 20 pages so 26 pages will be copied in 13hrs
• 9 years agoHelpfull: Yes(0) No(0)
• a can copy 50 pages let A=50,similarly A+B=70 both are in 10 hrs, by substituting value of A in 2nd eqn,we get B=20 in 10 hrs if 20 pages in 10 hrs then 26 pages equals (10/20)*26=13...
  
• 9 years agoHelpfull: Yes(0) No(0)
• 13 hr, as A+B=7 in 1 hr, so B=2 in 1 hr.
• 9 years agoHelpfull: Yes(0) No(0)
• 26*(70/50-1)*(10/50)
• 9 years agoHelpfull: Yes(0) No(0)
• time taken by a to copy pages=1050
  time taken by both a and b=1070
  time taken by b to copy pages=x26
  1a+1b=1a+b
  5010+26x=7010
  x=13
• 9 years agoHelpfull: Yes(0) No(0)
• 13 hrs
  
  
  A can do 5pages in 1hr
  and then B can do 2 pages in 1hr
  so,only B can take 13hrs to copy 26 pages..
• 9 years agoHelpfull: Yes(0) No(0)
• A in 1hr copies (50/10)or 5 pages. (A+B) in 1hr copies (70/10) or 7 pages.
  therefore, B in 1hr copies 2 pages. so B copies 26 pages in (26/2) or 13hrs.
• 9 years agoHelpfull: Yes(0) No(0)
• A can copy 50 pages in 10 hrs
  A+B=70 in 10 hrs
  B=20 in 10 hrs
  b can copy 26 pages in 13 hrs
• 9 years agoHelpfull: Yes(0) No(0)