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Question

A boat travels 50 km east, then 120 km north and finally it comes back to the starting point through the shortest distance. The total time of journey is 3 h. What is the average speed, in k m h to the power of negative 1 end exponent comma over the entire trip?

  1. Zero  
  2. 100  
  3. 17  
  4. 33.33  

The correct answer is: 100


    T i m e equals fraction numerator d i s t a n c e over denominator a v e r a g e blank s p e e d end fraction
    rightwards double arrow A v e r a g e blank s p e e d
    blank equals fraction numerator d i s t a n c e over denominator t i m e end fraction
    blank v equals fraction numerator 130 plus 120 plus 50 over denominator 3 end fraction
    blank equals fraction numerator 300 over denominator 3 end fraction equals 100 blank k m h to the power of negative 1 end exponent

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