SOLUTION: If a new machine can make one toy in two hours and an old machine can make one toy in 5 hours how long would it take them to make one toy together?

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Question 782518: If a new machine can make one toy in two hours and an old machine can make one toy in 5 hours how long would it take them to make one toy together?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add their rates of making toys
( 1 toy ) / ( 2 hrs ) + ( 1 toy ) / ( 5 hrs ) = ( 1 toy / t hrs )
+1%2F2+%2B+1%2F5+=+1+t+
Multiply both sides by +10t+
+5t+%2B+2t+=+10+
+7t+=+10+
+t+=+1.429+
+.429%2A60+=+25.7+
It will take them 1 hr and 26 min