issb mathematics MCQ #222

Pipes A and B fill a tank in 12 and 18 hours. Together they fill in:

issb mathematics MCQ #222

  1. Question 1

    Q1. Pipes A and B fill a tank in 12 and 18 hours. Together they fill in:

    • A) 6.5 hours
    • B) 7.2 hours
    • C) 8 hours
    • D) 9 hours

    Answer: 7.2 hours

    Explanation: Together rate is 1/12 plus 1/18, which is 5/36. Time is 36/5, which is 7.2 hours.