input and display data in cell in h:mm format without changing to time

I am wondering if someone could help me with a formula that I can put into the cells B38-AF38, that would display the sum of B20:AF20 + B24:AF24 + B28:AF28 + B32:AF32
+B36:AF36 in a h:mm format.

When imputing the data into a cell in a h:mm format, I need it to display in that cell and formula bar the h:mm format without having to put an apostrophe in front of "h" or ":mm" value. Once complete, this form is going to go to other trainers to use on their computers and I dont think they would remember to keep putting an apostrophe before the data.

Example:

B20= 1:15 (1h15m) NOT 1:15:00 AM

B24= :30 (30min)

B28= :45 (45min)

B32= 1:45 (1h45m) NOT 1:45:00 AM

B38= 4:15 (4h15min)

I have attached a copy of the form for better clarification.

It doesnt seem to be complicated, but it's certainly a lot more than I thought.

Thanks in advance.