SOLUTION: Hello could you please help me work out this word sum:2 engineers build robots for a company. Engineer A builds 10 robots in 6 hours while Engineer B builds 10 robots in 4 hours ho

Question 845176: Hello could you please help me work out this word sum:2 engineers build robots for a company. Engineer A builds 10 robots in 6 hours while Engineer B builds 10 robots in 4 hours how long will it take them to build 10 robots it they work together
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of working to get
their rate working together
A's rate:
( 10 robots ) / ( 6 hrs )
B's rate:
( 10 robots ) / ( 4 hrs )
--------------------
Let = the time in hours for them
to build 10 robots working together

Divide both sides by

Multiply both sides by

Convert hrs to minutes

Working together, they take 2 hrs 24 minutes
to build 10 robots

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