Answer: 1/2
Step-by-step explanation:
I'm assuming this is rise over run. The rise is 1 and the run is 2.
Remember,
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2 answers:
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c = Hours it take Cindy by herself
p =Hours it take Pam by herself
now, we know if they work together, they can finish in 10 hours, so let's take a peek at their rate.
whilst working together
in 1 hr Cindy has done 1/c "th" of the whole work
in 1 hr Pam has done 1/p "th" of the whole work
and since we know the whole work's time is 10 hours, in 1 hour they both have done 1/10 of whole lot, so