alleryHow long does A alone take? I: A and B together take 6 days. II: B alone takes 10 days.
ABoth together needed
BII alone suffices
CI alone suffices
DNeither, even together
Answer & Solution
Correct answer: A. Both together needed
A's rate is 1/6 minus 1/10, which is 1/15, so A needs 15 days using both facts.
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