Question

plz....give me the answer of this problem

Answer 1

Let Art does A amount of work per hour and Rita does R amount of work per hour

So amount of work = (A+R)*8

Amount of work is also given by A*12

Since amount of work is constant; (A+R)*8 = A*12

⇒ 8A + 8R = 12A

⇒ 8R = 4A

⇒ A= 2R

So amount of work = A*12 = 2R*12 = R*24

i.e Rita takes 24 hours to do it alone