Multiplying fraction

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Multiplying fraction
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• During a class bake sale, Sam had ¾ of a pan of
  chocolate cake left to sell at 2pm. An hour
  later he had sold 1/3 of that amount. How much
  of the whole cake was left after that hour?

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• During a class bake sale George had 2 pans of
  chocolate cake left to sell at 10am. And hour
  later he had sold 2/5 of that amount. How much
  of the whole cake was left after that hour

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• On a map of the city of Detroit, the library is
  5/12 of an inch from the post office. On the
  map, 1 inch represents 5 miles.
• What fraction of an inch represents 1 mile?
• How far apart are the post office and the library
  in actual?

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• A recipe for a large batch of cookies calls for
  3 ¼ cups of flour. Jenny wants to make 5 batches
  of cookies. How much flour should she use?

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• Philip rode his bicycle at 9 2/5 miles per hour.
  If he rode for 1 ¾ hours, how many miles did he
  cover?