The water from one outlet, flowing at a constant rate, can fill the swimming pool in 9 hours. The water from second outlet, flowing at a constant rate can fill up the same pool in approximately in 5 hours. If both the outlets are used at the same time, approximately what is the number of hours required to fill the pool?

• 1st outlet - 9 hrs
  2nd outlet - 5 hrs.
  both outlets together - (ab)/(a+b)
  - (9*5)/(9+5)
  - 45/14
  - 3.214 hours ..
  so , number of hours required to fill the pool is 3.214 hours ..
• 12 years agoHelpfull: Yes(18) No(0)
• The first outlet can fill the swimming pool in one hour is 1/9
  The second outlet similarly fill in one hour is 1/5
  Both together can fill in one hour is 1/9+1/5=14/45
  So, time required to fill the pool in 45/14hours=3.21hours
• 12 years agoHelpfull: Yes(9) No(0)
• In 1 Hour both outlet can fill 1/9+1/5=14/45
  So time to fill complete pool=45/14 hrs
• 12 years agoHelpfull: Yes(3) No(1)
• 1st one 1/9 part of tank fill by 1 hr
  2nd one 1/5 part of tank fill by 1 hr
  both 14/45 part fill by 1 hr
  both fill the tank by 45/14 =3.21 hrs
• 12 years agoHelpfull: Yes(3) No(0)