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Maths Puzzle
Numerical Ability
Curly can do a job in 30 min, Larry can do it in 40 min, and Moe can do it in 60 min. How long will it take them if they work together?
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solve:
20 0ver x = 20 over x-4 +4 over x
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A bicyclist rode into the country for 5 hours. In returning, her speed was 5 miles per hour faster and the trip took 4 hours. What was her speed each way?