if steve can mix 20 drinks in 5mins.sue can mix 20 drinks in 10mins and jack can mix 20 drinks in 15mins how much time will they take working together to mix 20drinks?

• steave can mix 20/5=4 drink in a minut
  sue can=20/10=2 drink
  jack can =20/15=4/3
  they work togather
  work of one minut when they work togather
  (4+2+(4/3))
  let they take x min to make 20 drinks
  
  (4+2+(4/3))*x=20
  on solving x=2.72 min
  
  
• 12 years agoHelpfull: Yes(21) No(1)
• time taken by 3 of them together to mix the drinks=((1/5)+(1/10)+(1/15)) = (11/30)
  time = 2.72 min
• 12 years agoHelpfull: Yes(8) No(0)
• steve-1 drink-5/20=1/4mins;
  sue-1 drink=1/2 mins;
  jack-1 drink=3/4;
  
  3drinks=(1/2+3/4+1/4);
  3 drinks=(6/4);
  1 drink together=(6/4)*(1/3);
  1 drink together=(1/2)mins
  20 drink together=10mins
  
• 12 years agoHelpfull: Yes(1) No(8)
• 2min 44 sec
• 12 years agoHelpfull: Yes(1) No(4)