- A16 min
- B5 min
- C4 min
- D6 min
Step-by-Step Solution
B runs all 21 min: . A supplied , i.e. ran min. It was stopped min. (16 min is how long A ran.)
Answer: B) 5 min
Pumps A and B fill a tank in 30 and 45 minutes. Both start together, but after 9 minutes A is stopped for repairs for a few minutes and then restarted. The tank is full exactly 21 minutes after the start. For how many minutes was A stopped?
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