Hi! So to find this answer, you could do it two ways. Firstly, you could spend a major amount of time doing this in your head. Or second, you could use a calculator and do 30/5. This would give you 6. So 6 minutes on each chore.
If you want to use a number line create a number line going up to 30 (1/2 an hour). Then, divide it by 5 and then you can see that each section is 6 units. So, she spends 6 min. on each chore. 6/60=1/10 She spends 1/10 of an hour on each chore.