A, B and C can complete a work in 12, 15 and 20 days respectively. If they work together, in how many days will the work be completed? MCQ with Answer and Explanation
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Question #1
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A is twice as efficient as B. If they complete a work together in 14 days, how many days will A alone take to complete it?
Correct Answer: Option D
Explanation:
Let efficiency of B = 1, then efficiency of A = 2. Combined efficiency = 3. Total work = 14 * 3 = 42 units. Time taken by A alone = 42 / 2 = 21 days.
Let efficiency of B = 1, then efficiency of A = 2. Combined efficiency = 3. Total work = 14 * 3 = 42 units. Time taken by A alone = 42 / 2 = 21 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 19 days and B in 22 days. If they work together, the work will be completed in:
Correct Answer: Option B
Explanation:
Combined rate = 1/19 + 1/22. Required time = 10.2 days.
Combined rate = 1/19 + 1/22. Required time = 10.2 days.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 33 days and B in 21 days. If both work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/33 + 1/21. Time = 12.83 days.
Combined rate = 1/33 + 1/21. Time = 12.83 days.
This question belongs to:
Maths
Time and Work
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