A is twice as efficient as B and can finish a job in 20 days less than B. In how many days can they complete the work together? MCQ with Answer and Explanation
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Question #1
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A can complete a work in 10 days and B in 30 days. If they work together, the work will be completed in:
Correct Answer: Option A
Explanation:
Combined rate = 1/10 + 1/30. Required time = 7.5 days.
Combined rate = 1/10 + 1/30. Required time = 7.5 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can do a work in 16 days and B in 26 days. They work together for 5 days. What percentage of work remains?
Correct Answer: Option C
Explanation:
Remaining work = (1 - 5*(1/16+1/26)) ×100 = 49.52%.
Remaining work = (1 - 5*(1/16+1/26)) ×100 = 49.52%.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 14 days and B can complete the same work in 19 days. If they work together, in how many days will the work be completed?
Correct Answer: Option A
Explanation:
Combined rate = 1/14 + 1/19. Time = 1 ÷ combined rate = 8.06 days.
Combined rate = 1/14 + 1/19. Time = 1 ÷ combined rate = 8.06 days.
This question belongs to:
Maths
Time and Work
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