Hannah can paint a room in 8 hours. Destiny can paint the same room in 10 hours. How long does it take for both Hannah and Destiny to paint the room it they are working together.
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Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity