- A36
- B75
- C150
- D30
Step-by-Step Solution
Combined rate = 1/60 + 1/90 = (3 + 2)/180 = 5/180 = 1/36 tank per minute, so the tank fills in 36 minutes.
Answer: A) 36
Two hosepipes fill a large terrace garden tank: the first alone in 60 minutes, the second alone in 90 minutes. How many minutes do they take running together?
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