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Solution: How long will it take Pedro can paint the same fence if he had to work alone?

How long will it take Pedro can paint the same fence if he had to work alone?

Problem Statement: ECE Board November 1995

Pedro can paint a fence 50% faster than Juan and 20% faster than Pilar, and together they can paint a given fence in 4 hours. How long will it take Pedro can paint the same fence if he had to work alone?

Problem Answer:

Pedro can paint the same fence in 10 hours, if he had to work alone.

Solution:

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