Two capillary tubes of same length but different radii r_1 and r_2 are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the radius of a single tube that can replace the two tubes so that the rate of flow is same as before

Two capillary tubes of same length but different radii r_1 and r_2 are

1.	Two capillary tubes of same length but different radii r_1 and r_2 are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the radius of a single tube that can replace the two tubes so that the rate of flow is same as before
Answer» `r_(1)^(4) + r_(2)^(4)` `(r_(1)^(2) + r_(2)^(2) )^(1/4)` `(r_(1)^(4) + r_(2)^(4) )^(1/4)` `r_(1) + r_(2)` ANSWER :C