Arithmetic Ability
Time and Work

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Q.

P and Q can do a work in 4 hours and 12 hours respectively. P starts the work at 9am and they work alternately for one hour each. When will the work be completed ?

View Answer

Correct choice: D

Explanation:

Work done by P and Q in the first two hours, working alternately = First hour P + Second hour Q ⇒1/4+1/12=1/3 work is completed in 2 hours Then, the total time required to complete the work by P and Q working alternately=2 x 3= 6hours Thus, work will be completed at 3pm.
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