Kira is choosing between two exercise routines.
In Routine #1, she burns 20 calories walking. She then runs at a rate that burns 10.5 calories per minute.
In Routine #2, she burns 38 calories walking. She then runs at a rate that burns 8.25 calories per minute.
For what amounts of time spent running will Routine #1 burn at most as many calories as Routine #2?
Use t for the number of minutes spent running, and solve your inequality for t .