question_answer

A contractor undertakes to do a piece of work in 36 days and employs 15 men to work 9 hours a day, but after 24 days, he finds that only \[\frac{\mathbf{3}}{\mathbf{5}}\]th of the work is finished. He then employ 3 more men For how many hours a day should all the men now work together to finish the work in time.  

A) 9 hours 

B)   10 hours

C) 11 hours                                               

D) \[9\frac{1}{2}\]

E) None of these