Fill in the blanks.

(i) A tap can fill a tank in 6 hours. The part of the tank filled in 1 hour is……………

(ii) A and B working together can finish a piece of work in 6 hours while A alone can do it in 9 hours. B alone can do it in ……….. hours.

(iii) A can do a work in 16 hours and B alone can do it in 24 hours. If A, B and C working together can finish it in 8 hours, then C alone can finish it in ……….. hours.

(iv) If A's one day's work is , then A can finish the whole work in……… days.