A pool which was 1/5 full to begin with, was filled at a constant rate for 6/5 hours until it was until it was 8/9 full. At this rate, how much time would it take to completely fill this pool if it was empty to begin with?  Options:	A) 8 hrs 45 mins.	B) 9 hrs.	C) 9 hrs 30 mins.	D) 1 hrs 45 mins.	E) 15 hrs 30 mins
The pool was 1/5 full initially.   In 6/5 hrs, it was filled to 8/9 of its capacity.   Therefore, in 6/5 hrs, 8/9 - 1/5 was the amount of volume filled.   So, 6/5 hrs = 8/9 - 1/5 = 31/45   Therefore, for filling the vessel from empty to full, you would require 6/5 * 45/31 = 1 Hrs 45 Mins.   Hence 1 hrs 45 mins.
<result>D</result>
A pool which was 1/5 full to begin with, was filled at a constant rate for 6/5 hours until it was until it was 8/9 full. At this rate, how much time would it take to completely fill this pool if it was empty to begin with?