How long will it take all four people together to build the sandcastle?

It takes John and Amy Brogan 6 hours to build a sandcastle. It takes Paul and Cindy Carter 4 hours to make the same sandcastle. How long will it take all four people together to build the sandcastle?
in Algebra 1 Answers by Level 1 User (320 points)

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1 Answer

rate 1=1/4=0.25

rate 2=1/6=0.166666666666666...

add 2 rates...0.416666666666666...

time=1/rate=1/0.416666666666

time=2.4
by
t=1/r=1/0.416666?
I cant figure out how u got 2.4
by Level 1 User (320 points)

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