A Mason can do a given job in 4 hrs. His helper can do the same job in 9 hours.  The mason begins working and after 1 hr. is joined by his helper. In how many  hrs will they complete the job? A. 2.08 hrs.  B. 4.87 hrs. C. 2.65 hrs.  D. 1.97 hrs

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A Mason can do a given job in 4 hrs. His helper can do the same job in 9 hours. 
The mason begins working and after 1 hr. is joined by his helper. In how many 
hrs will they complete the job?
A. 2.08 hrs. 
B. 4.87 hrs.
C. 2.65 hrs. 
D. 1.97 hrs 

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