Problema Solution
Melissa wants to exercise for at least 30 minutes today. She plans to both run and swim. Each lap she runs takes her 1.4 minutes, and each lap she swims takes her 1.1 minutes. Letting r be the number of laps she runs and s be the number of laps she swims, write an inequality showing that Melissa achieves her goal of at least 30 minutes of exercise.
Answer provided by our tutors
time taken for r laps of run = 1.4r
time taken for s laps of swim = 1.1s
hence total time taken = 1.4r + 1.1s
but this should be atleast 30 minutes hence
1.4r + 1.1s >= 30