- A
- B
- C
- D
Step-by-Step Solution
Tank units; A, give 3, 2, 1 per hour. 2 h all: 12. Next hour : 3 (total 15). fills the last 15 alone in 15 h. C's share units counts only the last stage.)
Answer: A)
Pipes A, B and C fill a tank in 10, 15 and 30 hours. All three are opened together; A is closed after 2 hours and B after a further 1 hour, and C finishes the job. What fraction of the water in the full tank came through C?
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