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JAMB Mathematics 1981 Question 25

Question 25

Linear and Simultaneous Equations

Two cars X and Y start at the same point and travel towards a point P which is 150km away. If the average speed of Y is 60km per hour and X arrives at P 25 minutes earlier than Y. What is the average speed of X?

  1. A.513/9km per hour
  2. B.72km per hour
  3. C.37½km per hour
  4. D.66km per hour
  5. E.75km per hour.
Show the answer and explanation

Answer: B (72km per hour)

Explanation

Y takes 150 ÷ 60 = 2½ hours, so X takes 2 hours 5 minutes = 125/60 hours. X's speed = 150 ÷ 125/60 = 72km per hour.