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WAEC Mathematics 2000 Question 43

Question 43

Ratio, Percentages and Rates

A tap leaks at the rate of 2cm3 per second. How long will it take the tap to fill a container of 45 litres capacity? (1 litre = 1000cm3)

  1. A.8 hours
  2. B.6hr 15min.
  3. C.4hr 25 min.
  4. D.3hr.
Show the answer and explanation

Answer: B (6hr 15min.)

Explanation

45 litres = 45000 cm3; at 2 cm3/s that is 22500 s = 6.25 hours = 6 hr 15 min.