Please answer this correctly

Answer:
9:59
Step-by-step explanation:
all you have to do is add the hours to the hours and the minutes to the minutes but if you get a number over 60 in the minutes section then you need to subtract 60 from that side until get a number under 60 then you add however many times you did that to the hours
Answer:
Step-by-step explanation:
9 minutes past 4 = 04:09
Then in 5hours:50minutes, add it to 04:09, then we obtain 09:59