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A and B can do a work in 4 hours and 12 hours respectively. A starts the work at 6AM and they work alternately for one hour each. When will the work be completed?
- A4 days
- B7 days
- C5 days
- D6 days
Correct answer: D
Discussion 1
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CCommunity
6 days
Work done by A and B in the first two hours, working alternately = First hour A + Second hour B =
1/4 + 1/12 = 1/3.
Total time required to complete the work = 2 * 3 = 6 days.
Work done by A and B in the first two hours, working alternately = First hour A + Second hour B =
1/4 + 1/12 = 1/3.
Total time required to complete the work = 2 * 3 = 6 days.