जॉइन Examsbookउत्तर : 4. "3 pm"
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 ?5
प्र: 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 ?
- 13 amfalse
- 212 pmfalse
- 31 pmfalse
- 43 pmtrue
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उत्तर : 4. "3 pm"
व्याख्या :
Answer: D) 3 pm Explanation: Work done by P and Q in the first two hours, working alternately = First hour P + Second hour Q ⇒14+112=13 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.