John pays $3 for the train and $2 for the bus each day. Which ordered pair represents how much money John spends in 15 days on trains and buses?
John spends $3 on the train each day, so in 15 days, he spends a total of $3*15 = $<<3*15=45>>45 on trains.
John spends $2 on the bus each day, so in 15 days, he spends a total of $2*15 = $<<2*15=30>>30 on buses.
Therefore, the ordered pair representing how much money John spends in 15 days on trains and buses is (45, 30). Answer: \boxed{(45,30)}.