it takes 30 minutes to fill 20 bucket using tab A while it takes 75 minutes to fill 35 bucket using Tap B which tap fills the bucket faster
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In 1 hour tap A will fill = 1÷5 part of tank
In 1 hour tap B will fill = 1÷4 part of tank
so in 1hour both will fill together = (1÷5) +(1÷4)
= (9÷20)part of tank
(9÷20) part is filled in 1 hour
1 part will be filled in = 1÷ (9÷20) = (20÷9) hr
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