Answers

  • Brainly User
2015-05-01T17:14:41+05:30
A fills at 1 tank per 20 minutes or 0.05 tank per minute 
B fills at 1 tank per 30 minutes or 0.0333 tank per minute 
C fills at –1 tank per 40 minutes or –0.025 tank per min 

add the three up to get 0.05833 tank/min or 17.1 minutes per tank. 

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2015-05-01T17:15:32+05:30
17.1 minutes per tank.  is the answer
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