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January 25, 2015

January 25, 2015

Posted by **Grant** on Monday, May 13, 2013 at 10:10am.

When the fuel started flowing the tank was already filled to a depth of 2.5m. If the rate at which the depth of fuel in the tank is increasing, in metres per hour is given by d'(t) = 4t +5, find:

(i) the rate at which the height is increasing after 20 minutes

(ii) the height of water in the tank after 20 minutes

(iii) the time it takes to fill the tank

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