Working together, Sarah and Heidi can milk the cows in 4 hours. If they work alone, it takes Heidi 6 hours longer than it takes Sarah. How long would it take Heidi to milk the cows alone?
?
A. 13 hours
B. 15 hours
C. 19 hours
D. 9 hours
E. 12 hours
Answer: E
Mathematics
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