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Two water tanks, X and Y, were drained simultaneously. If X

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Two water tanks, X and Y, were drained simultaneously. If X [#permalink] New post 09 May 2004, 10:53
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Two water tanks, X and Y, were drained simultaneously. If X contains 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to empty?

1. For every gallon drained from Y, 2 gallons drained from X.
2. Tank Y was drained at a constant rate of 20 gallons per hour.
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 [#permalink] New post 09 May 2004, 11:51
C it is.
From stem X = Y + 30

A) We dont know rate at which Y is drained.
B) We know rate of Y but not the rate of X
Combine and you get
20 * T = Y and X = 2 * 20 * T
40T = 20T+30 so T = 1.5 hours
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Re: DS-99 [#permalink] New post 11 May 2004, 00:53
hallelujah1234 wrote:
Two water tanks, X and Y, were drained simultaneously. If X contains 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to empty?

1. For every gallon drained from Y, 2 gallons drained from X.
2. Tank Y was drained at a constant rate of 20 gallons per hour.


X = Y + 30,

Tx = Ty,

X/Vx = Y/Vy

1. Vx/Vy = 2

2. Vy = 20.

So, neither 1 nor 2 alone is sufficient, but together 1 and 2 are sufficient.
Re: DS-99   [#permalink] 11 May 2004, 00:53
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Two water tanks, X and Y, were drained simultaneously. If X

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