Subracting Mixed Measures

Just borrow.

1 hr = 60 min.
1 min = 60 sec

3 hr 3 sec = 2 hr 60 min 3 sec = 2 hr 59 min 63 sec

Now subtract.

+ 2 hr 59 min 63 sec
- 1 hr 15 min 55 sec
 
A closer look at the HTML shows she tried to show us that she was aware of that.

Mom22, Denis' point is good. A nice place holder is worth a lot for maintaining clarity and showing understanding. Unfortunately, your efforts to provide spacing were discarded by the software. Alas.
 
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