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A cement standard requires an initial set of not less than 30 minutes and a final set of not more than 600 minutes. A sample sets initially at 45 minutes and finally at 11 hours. Does it comply?

  • A.yes, both figures are within the limits
  • B.no, the initial set is too short
  • C.no, the final set is too long
  • D.no, both figures are outside the limits

Answer: A

Forty-five minutes exceeds the minimum of thirty and eleven hours is 660 minutes, which is above the 600 permitted, so it does not comply after all. Converting hours to minutes before comparing is the step that decides it.

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