Consider a Device That Requires Two Batteries to Function

Consider a device that requires two batteries to function.If either of these batteries dies,the device will not work.Currently there are two brand new batteries in the device,and there are three extra brand-new batteries.Each battery,once it is placed in the device,lasts a random amount of time that is triangularly distributed with parameters 15,18,and 25 (all expressed in hours).When any of the batteries in the device dies,it is immediately replaced by an extra (if an extra is still available).Use @RISK to simulate the time the device can last with the batteries currently available.