A man drives from ibadan to Oyo, a distance of 48km in 45 minutes. If he drives at 72km/h where the surface is good and 48km/h where it is bad, find the number of kilometres of good surface.

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asked by somay
  1. total time = 45 min .75 hour

    72 t + 48(.75-t) = 48 etc

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    posted by Damon
  2. thank you, but where do you get 75 hr?

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    posted by somay
  3. Look carefully, Damon had .75 not 75

    45 minutes
    = 3/4 hour
    = .75 hours

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    posted by Reiny

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