She can spend 6minutes with each friend. Explanation step by step: Maria has 30 min break, she walks 3 min to another floor- we have deduct that 3 min from 30 mi 30-3=27 Than she walks 3 min back to her floor 27-3=24 She has 24 minutes left which she equally divided between 4 friends 24:4=6 6 is the answer