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A car travel at x km per hour for 1 hour and at y km…

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

  • A.
    (frac{2x + 2y}{3}kmh^{-1})
  • B.
    (frac{x + y}{3}kmh^{-1})
  • C.
    (frac{x + 2y}{3}kmh^{-1})
  • D.
    (frac{2x + y}{3}kmh^{-1})
Correct Answer: Option C
Explanation

Travelled x km/h for 1 hour (therefore) traveled x km in the first hour.

Traveled y km/h for 2 hours (therefore) traveled 2y km in the next 2 hours.

Average speed = (frac{x + 2y}{1 + 2})

= (frac{x + 2y}{3} kmh^{-1})

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