Michael K. answered 02/08/21
PhD professional for Math, Physics, and CS Tutoring and Martial Arts
Let's use unit-analysis to determine how to set up the equation...
Using the avg person of 169 lbs, we know that 7.9 calories are burned every minute. How much in 75 minutes?
7.9 cal 75 min. = 592.5 cal
--------- x
min
Notice how the time unit shows in the numerator of the second fraction and the denominator of the first fraction, this allow those to "cancel" and be left with calories as the only unit remaining, which is what we want...