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Question
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?
2p.m.
4p.m.
5p.m.
6 p.m.
None of these
ANSWER : 1
Descrption
<p>Total job=90</p><p>Asif Efficiency 90/15=6</p><p>Russel Efficiency 90/9=10</p><p>In 3 hr job done by Asif 6*3=18</p><p>Russel 10*3=30</p><p>Total job left (90-48)= 42</p><p>So, Asif can do the job in 42/6= 7 hours.</p><p>9 am + 7 hr = 4 pm. </p>
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