A and B together can complete a job in 10 days. A alone can complete it in 15 days. How long will B alone take?
Correct answer: B. 30 days
- A. 20 days
- B. 30 days
- C. 25 days
- D. 35 days
Explanation
This is correct because A's rate is 1/15, and A+B = 1/10, so B's rate is 1/10 − 1/15 = 1/30, hence B alone takes 30 days.
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Logical problems present several conditions about people, objects, events or choices and require their possible arrangements to be tested. They cover constraint-based reasoning, rankings, matching, grouping, scheduling and elimination, with attention to the difference between a complete solution and a possibility that merely satisfies one condition.
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