alleryTwo constant-rate workers finish together in 6 days. Alone, one takes 5 days longer. Faster worker alone?
A9 days
B10 days
C12 days
D15 days
Answer & Solution
Correct answer: B. 10 days
The equation 1/t+1/(t+5)=1/6 gives t²−7t−30=0 and the positive time t=10.
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