Question

if one pipe fill tha tank in 20 mins and second pipe fill the tank in 30 mins if two pipes are together fill the tank how much time they take

Answer 1

In 1 minute pipe A can fill = 1/20 of tank

In 1 minute pipe B can fill = 1/30 of tank

In 1 minute they both can fill =
$\frac{1}{20} + \frac{1}{30} \\ \\ = \frac{3 + 2}{60} \\ = \frac{5}{60} \\ = \frac{1}{12}$
In 1 minute together they can fill 1/12 of tank

So Time required to fill whole tank
= 1 ÷ 1/12
= 1 × 12
= 12 minutes


Hope it helps dear friend ☺️✌️✌️

Answer 2

solution;

$\frac{1}{t} = \frac{1}{20} + \frac{1}{30} \\ = \frac{3 + 2}{60} = \frac{5}{60} \\ = \frac{1}{12} \\ = > t = 12 \: minutes$
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Hope it helps

Amrit⭐