SOLUTION: An experienced bricklayer can construct a small wall in 2 hours. An apprentice can complete the job in 6 hours. Find how long it takes if they work together.

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Question 625619: An experienced bricklayer can construct a small wall in 2 hours. An apprentice can complete the job in 6 hours. Find how long it takes if they work together.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add their rates of working
experienced bricklayer:
( 1 job ) / ( 2 hrs )
apprentice:
( 1 job ) / ( 6 hrs )
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Let +t+ = time to do job working together
+1%2F2+%2B+1%2F6+=+1%2Ft+
Multiply both sides by +6t+
+3t+%2B+t+=+6+
+4t+=+6+
+t+=+3%2F2+
It will take them an hour and a half working together