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1) 144 seconds

2) 12

3) 24

Step-by-step explanation:

1) First off how many times can 15 dived into 90? 6! So we know it can go into 90 and that it's by 6. Next is to add 24 (seconds) 6 times. This will lead you too 144. So 144 seconds is your awnser

2) All you have to do is dived 72÷6. Which gives you the amount of each pack .

3) You take the total of step number two and 288 earsers and dived. so 288÷12=24

Hope this helps! If so please mark brainliest and rate/heart to help my account if it did