Problem of the Week

Teegan babysits for a neighbour. Calculate how many hours she babysits in all of these time periods:

* from 7:00 pm to 11:00 pm
* from 6:30 pm to 7:15 pm
* from 7:30 am to 11:15 am
* from 8:30 pm to 12:45 am

If she is paid $4/hour, how much money should Teegan earn?