



 
Larisa To solve problems of this sort (and "the one with the bathtub" and "the one with the lawnmowers" and many others) convert from time per unit of work to units of work per time. This typically lets cooperation be represented by addition and "working against each other" by subtraction. Racer 1 completes 1/28 lap per second or _________ laps (in 30 min). Racer 2 completes ________ lap per second or _________laps (in 30 min). How many more complete laps does Racer 1 complete? Good Hunting!
 


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 