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The diagram is the distance time graph of a vehicle. Find its average speed in...

Mathematics
JAMB 1982

The diagram is the distance time graph of a vehicle. Find its average speed in kilometers per hour during the journey

  • A. 155km/hr
  • B. 50km/hr
  • C. 40km/hr
  • D. 124km/hr
  • E. 84km/hr
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Correct Answer: Option E
Explanation

Distance = 155 - 50 = 105km

Time = 75mins

= \(\frac{75}{60}\)hr = \(\frac{5}{4}\)hr

Average speed = \(\frac{Distance}{time}\) = \(\frac{105}{\frac{5}{4}}\)

= \(\frac{105 \times 4}{5}\)

= 84km\h


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