a takes 12 hours to make a publication .b takes 10 hours to make it.how much time they take to make 2 publications independently?

• A can complete a publication in 12 hours and B in 10 hours and so the maximum time taken by both working independently to complete 2 publications will be 12 hours.
• 10 years agoHelpfull: Yes(19) No(4)
• L.C.M(12,10)=60 units
  a takes 12 hours-5units/hr
  b takes 10 hrs-6 units/hr
  a&b would take 11 units/hr
  both should publish 2 publication =120 units
  in 10 days a finish 50 units
  in 10 days b finish 60 units.total 110 units.remaining 10 units would be done by"B"because he would do it faster.he would finish 10 units in 1 4/6 hrs.total 10+1 4/6=11 4/6 hr.
  
• 10 years agoHelpfull: Yes(10) No(4)
• lcm(12,10)=60
  so a do 60/12=5units per day
  b do 60/10=6 units per day
  both a and b will do 5+6=11 units
  so how much time taken to both a and b is 60/11=5hr 5min per publication
  so for 2 piblications 2*5hr 5min=10hr10min
• 10 years agoHelpfull: Yes(7) No(3)
• Ans:- 10hr 10min
  
  Solution:-
  
  A takes make a publication = 12hr
  B takes make a publication = 10hr
  
  So, that
  
  A*12 = B*10
  6A = 5B
  
  both make a publication together time taken
  D is time taken by both to make a publication
  A*12 = (A+B)*D
  A*12 = (A+6A/5)*D
  D = 5hr 5min
  
  both make two publication independently together time taken = D*2
  = 5hr 5min *2
  = 10hr 10min
• 10 years agoHelpfull: Yes(4) No(6)
• a and b can make 1 publication in 5hr27min, so to make 2 publications
  they need 2*5h27m=10h54min
• 10 years agoHelpfull: Yes(2) No(2)
• answer is definately 12 hours because the max time is 12 hours n suppose both a and b starts at the same time then b will take 10 hours n after 10+2 hours a will complete his work..
  
• 10 years agoHelpfull: Yes(2) No(0)
• 12 hours to beacause it is maximum of 2
• 10 years agoHelpfull: Yes(1) No(0)
• 120/11
  1/12+1/10=11/60
  i.e.60/11 for 1
  120/11 for 2
• 10 years agoHelpfull: Yes(1) No(0)
• lcm of 12 ,10=60
• 10 years agoHelpfull: Yes(0) No(11)
• 120/11
  a&b work 11/60 in 1 hour
  
  
• 10 years agoHelpfull: Yes(0) No(0)
• a does 8.33% of job in 1 hr where as b does 10% of job in 1 hr.. together they do 18.33 % job in 1 hr.. so to total work they need 100/18.33=5.45 hr =5hr 27 min.. therefore total =10 hr 54 min
  
• 10 years agoHelpfull: Yes(0) No(0)
• 11hours 40minutes
• 10 years agoHelpfull: Yes(0) No(0)
• two publications simultaneously means they both makes two - two publications .
  then a takes 1/24 and b takes 1/20 they combinedly makes in 120/11 hours= 10.9
• 10 years agoHelpfull: Yes(0) No(0)