20 Tank

Please help with word problem?

One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

in one min ,

first pipe fills = 1/20 tank

second fills = 1/30 tank

together, in one minute

they fill = 1/20 + 1/30

= 50/600 tank

= 1/12 tank

so, together,

time taken to fill the tank = 12/1 = 12 minutes

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