1. Count up to subtract
	  11:30
	- 11:00
	_________
         
	0 hrs and 30 mins
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2. Count up to subtract
	  11:30
	- 10:00
	_________
	
	
	_________

3. Count up to subtract
	  11:30
	-  9:45
	_________
	
	
	_________