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1. Asif can do a job in 15 hours, and Russel can do the same job in 9 hours. If they start doing the job together at 6 a.m. and Russel stops working at 9 a.m. at what time will Asif finish the job?
- A. 2p.m.
- B. 2p.m.
- C. 2p.m.
- D. 2p.m.
Answer: Option A
Explanation:
6 am to 9 am is 3 hour
Asif, Needs 15 hrs to do 1 whole work
3 needs 3/9 = 1/3
work left = 1 - ( 1/5 + 1/3) = 1 - 8/15 = 7/15
Asif can do 1 work in 15 hours
asif can do 7/15 work ( 15×7) /15 = 7 hour
7 hour after 9 am is 2 pm
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