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SASMO 2019 Grade 6 Question 10

SASMO · SASMO 2019 Grade 6

Question 10

A pipe can fill an empty tank in 4 hours. Due to leakage, the pipe fills the empty tank in 12 hours. If the tank is full and the pipe is removed, how long will the leakage take to empty it?

Assume constant filling and leakage rates throughout.
  1. 6 hours
  2. 8 hours
  3. 9 hours
  4. 16 hours
  5. None of the above