A can fill a tank in 5 hours, and B can fill it in 10 hours and C can fill it in 30 hours. All pipes are opened simultaneously the tank will be filled in ( hours)
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all tap fill tank in 3 hours
tap A fill in 1hr.= 1/5
tab B fill tank in 1hr.= 1/10
tab C fil tank in 1hr.= 1/ 30
all fill in 1 hr.= 1/5+1/10+1/30
= 1/3
so reciprocal it = 3hour
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