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.