A work has been done by the two person in 24 min. one of them can do this work a lonely in 40 min. how much time required to do the same work for the second person?

(a) 16 Min (b) 64 Min (c) 60 Min (d) 34 Min

• (c) 60 Min.
  
  If A & B completes the work individually in 40 min. & 'x' min. respectively,
  then,(1/40)+(1/x)= 1/24
  1/x= 1/60
  x=60
• 9 years agoHelpfull: Yes(4) No(0)
• 1/24-1/40=1/60 hence work is done in 60 days
• 9 years agoHelpfull: Yes(2) No(0)
• Let t = time for 2nd person to do the job
  Let the completed job = 1
  A shared work equation
  24/40 + 24/t = 1
  reduce the fraction
  3/5 + 24/t = 1
  multiply eq by 5t, results
  3t + 5(24) = 5t
  120 = 5t - 3t
  120 = 2t
  t = 60 min aloneLet t = time for 2nd person to do the job
  Let the completed job = 1
  A shared work equation
  24/40 + 24/t = 1
  reduce the fraction
  3/5 + 24/t = 1
  multiply eq by 5t, results
  3t + 5(24) = 5t
  120 = 5t - 3t
  120 = 2t
  t = 60 min alone
  
  c option
• 9 years agoHelpfull: Yes(1) No(1)
• for example take they need to complete articles
  total work is 120articles
  1st person per day work is 3articles
  so,first person can complete 72articles(3*24)in 24 minutes,
  remaining work is 120-72=48articles
  second person complete these 48 work in 24 days,
  hence his per day work is 2articles
  then he need 60 min to complete 120articles
• 9 years agoHelpfull: Yes(0) No(0)
• ans=60 min
  AB/(A+B)=24
  A*40/(40+A)=24
  A=60min
• 9 years agoHelpfull: Yes(0) No(0)
• 1/a+1/b=1/24
  1/40+1/b=1/24
  1/b=1/24-1/40
  =16/960
  =1/60
  60 mins
• 9 years agoHelpfull: Yes(0) No(0)
• The answer is 60min
  
• 8 years agoHelpfull: Yes(0) No(0)
• 1/40-1/24=x
  x=1/60
  ie 60 min
• 8 years agoHelpfull: Yes(0) No(0)
• 1/x=1/24 - 1/40
  x= 60
• 7 years agoHelpfull: Yes(0) No(0)