a)
[tex]\frac{3\text{ games}}{2.5\text{ hours}}\rightarrow1.2\text{ games per hour}[/tex]b)
[tex]\frac{42\text{ dollars}}{3\text{ games}}\rightarrow14\text{ dollars per game}[/tex]c)
[tex]\frac{42\text{ dollars}}{4\text{ persons}}\rightarrow10.5\text{ dollars per person}[/tex]d) 2 and a half hours are 150 minutes. Thereby,
[tex]\frac{42\text{ dollars}}{150\text{ minutes}}\rightarrow0.28\text{ dollars per minute}[/tex]