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If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?

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Which is a better fit, a square peg in a round hole or a round peg in a square hole?

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Age 11 to 14 Challenge Level:
Anne is running around a circular track completing each circuit in 40 seconds. Brenda runs in the opposite direction and meets Anne every 15 seconds. How long does it take Brenda to run around the track?

Cathy is running in the same direction as Anne and passes her every 60 seconds. How frequently do Cathy and Brenda pass each other?