<PRE><B>Question 916135</B>
Mike can paint one chair in 4 hours. Laura can paint 3 chairs in 7 hours. If they work together how long will it take them to paint 2 chairs?


Mike can paint one chair in 4 hours. 
he can paint 2 chairs in 8 hours

Laura can paint 3 chairs in 7 hours.  
she can paint 2 chairs in 14/3 hours

Let painting two chairs be 1 job

Mike does 1/8 of the job in 1 hour
Laura does 3/14 of the job in 1 hour

In 1 hour they together do 1/8 + 3/14 of the job

=21/56 of the job in 1 hour

so they take 56/21 hours together

= 2.66 hours





If they work together how long will it take them to paint 2 chairs?</PRE>