Two capillary tubes of radius r but of lengths l_(1) and l_(2) are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the length of a single tube that can replace the two tubes so that the rate of flow is same as before

Two capillary tubes of radius r but of lengths l_(1) and l_(2) are fit

1.	Two capillary tubes of radius r but of lengths l_(1) and l_(2) are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the length of a single tube that can replace the two tubes so that the rate of flow is same as before
Answer» `l_1 + l_2` `( 1) /( l_1) + (1)/( l_2)` `( l_1 l_2)/( l_1 + l_2)` `(1) /( l_1 + l_2)` ANSWER :C