issb mathematics MCQ #813

Pipe A fills 5 h, B empties 10 h. Net fill time?

issb mathematics MCQ #813

  1. Question 1

    Q1. Pipe A fills 5 h, B empties 10 h. Net fill time?

    • A) 8 h
    • B) 9 h
    • C) 10 h
    • D) 12 h

    Answer: 10 h

    Explanation: Net rate 1/5 minus 1/10 equals 1/10 so 10 hours. Work each step carefully; ISSB math rewards accuracy under time pressure.