A and B can do a piece of work in 15 days and 10 days respectively. They started the work together, but A left after 2 days. In how many days will B complete the remaining work? MCQ with Answer and Explanation
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Question #1
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A can complete a work in 24 days and B can complete the same work in 34 days. If they work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/24 + 1/34. Time = 1 ÷ combined rate = 14.07 days.
Combined rate = 1/24 + 1/34. Time = 1 ÷ combined rate = 14.07 days.
This question belongs to:
Maths
Time and Work
Question #2
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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?
Correct Answer: Option A
Explanation:
B takes 12 days, so A takes 6 days. Total work = 12 units. Efficiency of A = 2, B = 1. Combined efficiency = 3 units/day. Time taken together = 12 / 3 = 4 days.
B takes 12 days, so A takes 6 days. Total work = 12 units. Efficiency of A = 2, B = 1. Combined efficiency = 3 units/day. Time taken together = 12 / 3 = 4 days.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 16 days and B in 20 days. If both work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/16 + 1/20. Time = 8.89 days.
Combined rate = 1/16 + 1/20. Time = 8.89 days.
This question belongs to:
Maths
Time and Work
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