Book Maths Puzzle Number System

Dennis can eat a pie in 6 minutes. David can eat a pie in 12 minutes. Robert can eat a pie in 14.639145073927682623334797247841 minutes. If they share the pie, how

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Book Other Question

Write down .99999999999......
in the P/q form?
Justify your answer with correct reason. Two planes leave O'Hare Airport in Chicago at the same time. One flies directly east at 540 mph. The other flies directly west at 720 mph. How long will it take them to be 1890 miles apart?