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Speed and Percentage Reduction Journey Problem

Speed and Percentage Reduction Journey Problem

Secondary 1

James ran \(14\) km from his house in \(1\) hour \(45\) minutes. He rested for \(40\) minutes before walking home. His walking speed was \(40\%\) less than his running speed.
Calculate

  1. his running speed, in km/h.
  2. his walking time, in hours and minutes.
  3. his average speed, in m/s, for the whole journey.

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Answer:(a) \(8\text{ km/h}\) (b) \(2\) hours \(55\) minutes (c) \(1\frac{11}{24}\text{ m/s}\) (approximately \(1.46\text{ m/s}\))

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