Answer: To find out how many miles Marcus will complete when he spends a total of 30 minutes running at the same pace, we need to divide the total time by the time it takes him to run one mile.
Given that Marcus runs one mile in 7.5 minutes, we can set up the following equation:
Miles completed = Total time / Time per mile
Plugging in the values:
Miles completed = 30 minutes / 7.5 minutes
Dividing 30 by 7.5:
Miles completed = 4
Therefore, Marcus will complete 4 miles when he spends a total of 30 minutes running at the same pace.