book Maths Puzzle Numerical Ability

(y-4)-(y+2)=5y

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A train left Shawnee traveling due west at 90 miles per hour. A car left Shawnee at the same time traveling due east at 60 miles per hour. How long will it take before the train and car are 405 miles apart? Put in nearest tenth of an hour.

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4 consecutive odd integers whose sum = 336