Though this question seems to be require that you know the flow rate equation, you can actually figure it out simply based upon the units in the question stem.
The answer is looking for a value with units of L/min. L is a volume which means it is represents a three dimensional value/distance/area. Volumes are expressed as units of length to the third power. And seconds need to be converted to minutes. Just make sure the units end up where you need them and you get the question right.
(Also, this approach works almost every time for ever calculation question on this test other than when calculating a half-life because need to multiply by 0.7 constant. Additionally, when calculating loading doses/maintenance doses with a bioavailability that is not equal to 1.)
submitted by โandro(269)
Flow rate ( Q) = V * A
V- velocity A - cross sectional area
Our velocity is given as 20cm/sec Convert this to cm/min 20cm/sec * 60seconds = 1200cm/min
Plugging in this value into our equation for flow rate we get 1200cm/min * 2 square cm = 2400 cubic cm /min
Note : 1000 cubic cm = 1 L and therefore we can convert our answer to L/min which are the required units by dividing by 1000
= 2.4 L/min