Answer:
6.85 or 6 7/8
Explanation:
If they work together the the will able to saw an area of ( 25/16 + 25/12 ) quilt per hour
= 1.5625 + 2.083
= 3.6455
For sewing 25 sq feet, it will take 25/ 3.6455 = 6.85 hours
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