<PRE><B>Question 581680</B>
Joe need 3 days to tile a rectangular pool of even depth. How long will it take him working at the same rate to tile a pool twice as long,twice as wide and twice as deep.
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Let original surface area be LW + 2WH + 2LH
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New surface area will be (2L)(2W) + 2(2W)(2H) + 2(2L)(2H)
= 4LW + 8WH + 8LH = 4[LW + 2WH + 2LH) 
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Original time to tile = 3 days
New time to tile = 4*3 = 12 days.
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cheers,
Stan H.</PRE>