To determine how many kilograms of dried fruits are crushed per minute, you need to divide the total weight of the dried fruits by the time taken. In this case, the correct process to solve this problem would be:
3 1/4 ÷ 3/4
This means you are dividing 3 1/4 kilograms (the weight of the dried fruits) by 3/4 of a minute (the time taken), which will give you the rate of crushing in kilograms per minute.