Question

if a tap fills a tank in 8 hours and other tap fills in 4 hour .how much time will it take to the tank together

Answer 1

8/3hr...................

Answer 2

let x be time required
hence
$\frac{1}{8} + \frac{1}{4} = \frac{1}{x} \\ \frac{1}{x} = \frac{3}{8} \\ x = \frac{8}{3}$