Speed Time And Distance MCQ

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• A person travels three equal distance at a speed of x km/hr, y km/hr and z km/hr respectively. What is the average speed for the whole journey ?
  ক

  $$\frac{{xyz}}{{3\left( {xy + yz + zx} \right)}}$$    km/hr

  খ

  $$\frac{{xyz}}{{\left( {xy + yz + zx} \right)}}$$    km/hr

  গ

  $$\frac{{\left( {xy + yz + zx} \right)}}{{xyz}}$$    km/hr

  ঘ

  $$\frac{{3xyz}}{{\left( {xy + yz + zx} \right)}}$$    km/hr
• A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour ?
  ক

  3.6 km/hr

  খ

  7.2 km/hr

  গ

  8.4 km/hr

  ঘ

  10 km/hr