SOLUTION: Frank can type a report in 2 hours and James takes 5 hours. How long will it take the two of them typing together?

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Question 452385: Frank can type a report in 2 hours and James takes 5 hours. How long will it take the two of them
typing together?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add their rates of typing
Frank's rate:
( 1 report) / ( 2 hrs )
James' rate:
( 1 report ) / ( 5 hrs )
-----------------
+1%2F2+%2B+1%2F5+=++1%2Fx+
Multiply both sides by 10x
+5x+%2B+2x+=+10+
7x+=+10+
+x+=+1.43+
It will take them 1.43 hrs