Answer:
Ashley and her 4 friends would required 5.33 hours to repair 1575 bags of sample.
Explanation:
75% is written as 0.75 as a decimal or 3/4 as a fraction.
Her friends take 75% longer, so multiply the time it takes Ashley by 1 + the percentage: 1.75 as a decimal or 
 as a fraction.
 as a fraction.
 .
.
1 hour = 60 minutes.
Divide minutes in an hour by minutes per pack:
Ashley can pack: 

1 friend can pack: 

multiply the amount 1 friend can pack by 4 friends: 

Ashley and her friends can pack 

Now divide the total bags by bags per hour:
 ( Round answer as needed.)
 ( Round answer as needed.)
Hence, Ashley and her 4 friends would required 5.33 hours to repair 1575 bags of sample.