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February 9th, 2009, 02:53 PM   #1
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related rates

the cross section of a 5 meter trough is an isosceles trapezoid with a 2 meter lower base, a 3 meter upper base, and an altitude of 2 meters. Water is running into the trough at a rate of 1 cubic meter per minute. how fast is the water level rising when the water is 1 meter deep.

i need help doing this problem thank you for any help.
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February 9th, 2009, 03:33 PM   #2
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Let h denote the depth. What is the area of the exposed water surface in terms of h?
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February 9th, 2009, 04:57 PM   #3
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Re: related rates

im sorry but i still dont understand'
would the area be A=1/2(1st base + 2nd base)h
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February 12th, 2009, 05:52 AM   #4
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What did you not understand? What happens to the area of the exposed water surface as h increases from zero meters to two meters?
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