Someone doing a triathlon (bike, run, swim) could calculate what their a possible race time could be for themselves. If they knew how fast they completed the biking aspect of the race, and they knew that they were approximately 3 times faster on bike than running, they could figure out their average running time. They could also figure out their approximate swimming time if they knew what their average speed of swimming downstream was, and also knew what kind of effect the current had on their average speed. Overall this could also help the participant in achieving a faster time as they could see where possible error and time-lost are, and train to prevent any unnecessary time loss.
A baker could also use rational expressions when mixing up new recipes. They could use calculations to see how much flour, oil, chocolate, etc to add to perfect a certain cake. If they wanted to make a healthy cake, in which 75% of the cake was made up of fruit and vegetables, they could figure out the amount of cups, etc. needed to be added.
Rational expressions are used in many more jobs, and I'm sure that some of us will in fact come across them in our lifetime.
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