Kevin gets on an elevator in a skyscraper. The elevator starts to move at a rate of -15ft/s. After 4 seconds on the elevator, Kevin is 260 ft from the ground floor of the building. Determine at this rate how long it will take after Kevin enters the elevator for him to exit the elevator on the ground floor: seconds
(ENTER ONLY A NUMBER AS YOUR ANSWER. Round your answer to the nearest hundredths place)