Calculate the change in length on a copper (coefficient of linear expansion for copper is 17 * 10-6 / oc) rod that is 25 meters that undergoes a temperature change of 15 o

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?