Tank PS

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aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sun Jan 18, 2009 9:09 am

A fills the tank 3 hours. B fills the tank 1.5 hours. C empties the tank 4 hours. If the tank is 3/4th filled, how long will it take A & B to fill when C is minusing?

To solve,I framed this equation:
t/3 + t/1.5 = 1/4 + t/4

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Source: Beat The GMAT — Problem Solving | Sun Jan 18, 2009 9:09 am

arzanr: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Wed Jan 07, 2009 1:56 pm; Thanked: 12 times; GMAT Score:750

by arzanr » Sun Jan 18, 2009 9:13 am

I get 20 minutess. Is that correct?

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aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sun Jan 18, 2009 9:24 am

yup, solving the above equation, we get 20 minutes.

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