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WAEC Mathematics 1999 Question 36

Question 36

Linear and Simultaneous Equations

A car travels at x km per hour for 1 hour and at y km per hour for 2 hours. Find its average speed.

  1. A.(2x + 2y)/3 km h−1
  2. B.(x + y)/3 km h−1
  3. C.(x + 2y)/3 km h−1
  4. D.(2x + y)/3 km h−1
Show the answer and explanation

Answer: C ((x + 2y)/3 km h−1)

Explanation

Total distance = x + 2y km in 3 hours, so average speed = (x + 2y)/3 km/h.