Big Pete's House of Munch stays open 24 hours per day, every day of the year. The total number of customers served during 2016 was 12% greater than the total for 2015. The average number of customers in the restaurant also increased, by 16%, in that time. Calculate the change (increase or decrease) in the average duration of customer visits from 2015 to 2016. Round you answer to the nearest 0.1%

answer :3.5%

explain using little's law