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A large rubber cushion can be filled with air pump in 10 minutes, another pump can fill the same cushion in 12 min. If both the pumps operate together how long will it take to fill the cushion ?
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- 5 5/11 minutes
1 minute filling by both=(1/10)+(1/12)=11/60
So time taken to completely fill=60/11=5 & 5/11 minutes - 9 years agoHelpfull: Yes(23) No(0)
- one pump's one minute work = 1/10
another pump's one minute work = 1/12
two pump one min work together = 1/10 + 1/12 = 11/60
so they complete in (60/11) min = 5 5/11 min - 8 years agoHelpfull: Yes(1) No(0)
- Ans is 5.45 min
- 8 years agoHelpfull: Yes(0) No(0)
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