If, like me, you dislike memorizing formulas, but are okay doing the actual math, I always just look at the units. It wanted L/min, and I had to get it using cm^2 and cm/sec...
Well, I know cm^3 gives volume (L) after bashing out a few conversions, so multiply it is!
Then I know to turn seconds into minutes, so multiply by 60.
Now, at this point, I knew my decimals were off, but still, 4x6 = 24, so it's some version of that. Had they included 24 or .24 as answers, I'd have actually had to pay attention to my conversions.
Anyways, I hope that helps!