SOLUTION: it took john two hours to paint a certain room. it took his brother roberts three times slower. how long will it take them if they work together?
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Question 916692: it took john two hours to paint a certain room. it took his brother roberts three times slower. how long will it take them if they work together? Found 2 solutions by ankor@dixie-net.com, Alan3354:Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! it took john two hours to paint a certain room.
it took his brother roberts three times slower
how long will it take them if they work together?
:
If John took two hrs and Robert was 3 times slower, Robert would take 6 hrs
:
Let t = time required when working together
let the completed job = 1 (a painted room)
:
Write a shared work equation, each will do a fraction of the job, the two fractions must add up to 1
: + = 1
multiply the equation by 6, cancel the denominators & you have:
3t + t = 6
4t = 6
t = 6/4
t = 1.5 hrs working together
