An oil tank has to be drained for maintenance. The tank is shaped like a cylinder that is 3.5 ft long with a diameter of 1.4 ft . Suppose oil is drained at a rate of 2.1 ft3 per minute. If the tank starts completely full, how many minutes will it take to empty the tank? Use the value 3.14 for π , and round your answer to the nearest minute. Do not round any intermediate computations.

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\[V=\frac{ \pi d^2h }{ 4 }\]

Then divide by the volume by the rate to find the time

is that the correct formula ? is it supposed to be r^2 instead of d^2?

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