12 students chartered a car to go to the park to play, and the car rental fee was shared equally among them. Just before boarding the car, 3 classmates came to go with them, so that the car rental fee was shared equally among 15 people. Therefore, each of the original 12 people paid 1 yuan less than the original plan. How much is the car rental fee?
12名同学包租一辆汽车到公园去玩，租车费大家平均分摊．临上车时又来了3名同学和他们同去，这样租车费就15人平均摊了，因此原来的12人每人比原计划少出了1元钱，租车费是多少元？
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">1 * 4 * 15</gadget>
<output>60</output>

<result>60</result>