When a digital clock reads 3:47 the sum of digits is 14. how many minutes after 3:47 will the sum of digits be 20 for the first time

OK, so what they are doing is adding the 3 + 4 + 7 to get 14, so you have to find the closest time that the combined number equal 20, I believe the closest time is 6:59 but don't quote me on it. so there is a 3 hour 12 minuted difference, it wants to know the time it will take to get there in minutes so 3 times 60 is 180 plus the 12 so 192, I believe the correct answer is 192 minutes.