joe and jenifer are going to wash windows. working alone, it would take jenifer 4 hours to was the windows. it would take joe 3 hours to wash the windows by himself. how long will it take then to wash the windows working together?

• Ans>12/7 hr
  Bcz
  1/4+1/3=(3+4)/12
  =7/12
  So
  Total time is 12/7
• 9 years agoHelpfull: Yes(0) No(0)