Eric's dad says that their car is traveling at 60 miles per hour. What does per hour refer to? Please I need this for a test, it’s due today :(

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?