So you need to divide your answer by three than multiply by 5 and that would give you your answer
You can convert everything in minutes once you've solved it you turn it back to hours and minutes....5hrs and 8min= 308min....3hrs 12min=192min....308-192=116.....116 is 1hr and 56min
16 because 36 divided by 9 is 4 so you have to multiply the 4 x 4