Idon't understand what to do because i don't understand the question

Find the 2 different rates at which the farm worker worked:

3 pints
= 0.75 pint/min
4 min

2 pints
= 0.67 pint/ min
3 min

Then you need to subtract 0.67 pint/min from 0.75 pint/min to answer this question.

Alternatively, subtract 2/3 pint/min from 3/4 pint/min.

This a very hard question about this place and this company does the right thing and the company always makes you think you can do what black

Ithink the answer is discovery verbs because they are quite similar to the verb 'discovering'