A can complete a work in 15 days and B in 26 days. If they work together, the work will be completed in: MCQ with Answer and Explanation
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Question #1
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A is twice as fast as B. If A and B together can complete a piece of work in 8 days, in how many days can A alone complete it?
Correct Answer: Option B
Explanation:
Let efficiency of B = 1, then efficiency of A = 2. Combined efficiency = 3 units/day. Total work = 8 * 3 = 24 units. Time taken by A alone = 24 / 2 = 12 days.
Let efficiency of B = 1, then efficiency of A = 2. Combined efficiency = 3 units/day. Total work = 8 * 3 = 24 units. Time taken by A alone = 24 / 2 = 12 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 25 days and B in 50 days. After working together for 5 days, what percentage of work remains?
Correct Answer: Option D
Explanation:
Remaining work = (1 - 5*(1/25+1/50))×100 = 70.0%.
Remaining work = (1 - 5*(1/25+1/50))×100 = 70.0%.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 30 days and B in 22 days. If both work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/30 + 1/22. Time = 12.69 days.
Combined rate = 1/30 + 1/22. Time = 12.69 days.
This question belongs to:
Maths
Time and Work
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