issb mathematics MCQ #252

Pipes fill in 10 and 15 hours. Together:

issb mathematics MCQ #252

  1. Question 1

    Q1. Pipes fill in 10 and 15 hours. Together:

    • A) 5 hours
    • B) 6 hours
    • C) 7 hours
    • D) 8 hours

    Answer: 6 hours

    Explanation: Rate is 1/10 plus 1/15, which is 1/6. Time is 6 hours.