A is twice as fast as B. If B can complete a work in 12 days, in how many days can A and B together complete the work? MCQ with Answer and Explanation
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Question #1
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If 3 men or 5 women can do a piece of work in 12 days, in how many days will 6 men and 5 women complete the same work?
Correct Answer: Option A
Explanation:
3 Men = 5 Women => 6 Men = 10 Women. 6 men + 5 women = 10 women + 5 women = 15 women. Since 5 women take 12 days, 15 women will take (5 * 12) / 15 = 60 / 15 = 4 days.
3 Men = 5 Women => 6 Men = 10 Women. 6 men + 5 women = 10 women + 5 women = 15 women. Since 5 women take 12 days, 15 women will take (5 * 12) / 15 = 60 / 15 = 4 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 18 days and B can complete the same work in 18 days. If they work together, in how many days will the work be completed?
Correct Answer: Option C
Explanation:
Combined rate = 1/18 + 1/18. Time = 1 ÷ combined rate = 9.0 days.
Combined rate = 1/18 + 1/18. Time = 1 ÷ combined rate = 9.0 days.
This question belongs to:
Maths
Time and Work
Question #3
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10 men can complete a work in 20 days. If 14 men work at the same rate, in how many days will the work be completed?
Correct Answer: Option B
Explanation:
Total work = 10 × 20 = 200 man-days. Required days = 200/14 = 14.29 days.
Total work = 10 × 20 = 200 man-days. Required days = 200/14 = 14.29 days.
This question belongs to:
Maths
Time and Work
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