Question

it takes 3 mins to fill a water tank using pipe A and 5 mins to fill the same tank using pipe b alone how long will it take to fill the water if pipes a and b are used together, in minutes and seconds?
T = t1*t2/(t1+t2) = 3*5/(3+5) = 1.875 Min. = 1 min, and 52.5 Sec.

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