Answers (3)
A conversion factor is a fraction equal to 1. You are given that one hour equals 60 minutes so you can write that as hr/60min=1 or 60min/hr=1 whichever works for you and drop it into an equation anywhere and it only changes the units.
ANSWER = You write this first so it looks like you know what you are doing. That gives you a bit of time to figure out what to do next.
ANSWER = 13km/hr x 60min/hr Ok, now we check everything. This is called sanity check and it is especially important in chemistry and physics where you might have a dozen or so conversions in a single equation. We have km above the fraction bar and that appears in the answer like we want. We have hr below the bar and ... Oops, that is backwwards.
ANSWER = 13km/hr x hr/60min Now we have hr below the bar and again above, so that cancels. We have min below the bar and that appears in the answer like we want. Now we multiply all the numbers above the bar and divide by all the numbers below.
ANSWER = 13km/hr x hr/60min = 0.21666... km/min
