Cost of renting a truck for one day = $96
Money Calvin can spend = $120
Money left with Calvin after he spends on the daily rent :
[tex] = \tt120 - 96[/tex]
[tex] = \tt\$ 24[/tex]
Cost charged per mile = 0.60
Number of miles he can drive the rental truck :
[tex] =\tt 24 \div 0.60[/tex]
[tex] = \color{plum}\tt40 \: \: miles[/tex]
Thus, number of miles he can run the truck = 40 miles
Therefore, Calvin can run the truck for 40 miles after he pays the daily fee.