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JAMB Mathematics 1979 Question 28

Question 28

Ratio, Percentages and Rates

On each market day Mrs. Bassey walks to the market from her home at a steady speed. This journey normally takes her 2 hours to complete. She finds, however, that by increasing her usual speed by 1km/hr she can save 20 minutes. Find her usual speed in km/hr.

  1. A.1⅔
  2. B.2
  3. C.5
  4. D.6
  5. E.10.
Show the answer and explanation

Answer: C (5)

Explanation

The distance is the same: 2v = (5/3)(v + 1), since the faster trip takes 1 h 40 min. So 6v = 5v + 5 and v = 5km/hr.