SOLUTION: John can finish a job two hours longer than Cris. after working for one hour,Cris joins him and complete the job in 3 more hours. how long would it take john to finish the job if h
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Question 896951: John can finish a job two hours longer than Cris. after working for one hour,Cris joins him and complete the job in 3 more hours. how long would it take john to finish the job if he worked alone?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Let x = time for Chris to do the job himself alone.
Rates of Work For Each Worker:
John,
Chris,
RT=J for Rate, Time, Job.
Account for the 1 job which John and Chris do.
.
This is amount of job John does in 1 hour plus amount of job both John and Crhis do together for 3 hours.
Solve for x and then evaluate x+2.
Begin recognizing the lowest common denominator is x(x+2); and multiply the members by this, and simplify.
Solve ...
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