An empty pool being filled with water at a constant rate takes 8hours to fill to 2/5 of its capacity.how much more time will it take to finish filling the pool?
Choose the correct choice:	A) 5hr 30min	B) 5hr 20min	C) 4hr 48min	D) 3 hr 12min	E) 2hr 40 min
As pool is filled to 2/5 of its capacity then 2/5 of its capacity is left to fill.   To fill 3/5 of the pool took 8 hours --&gt; to fill 2/5 of the pool will take 8/(3/5)*2/5=16/3 hours = 5 hours 20 minutes (because if t is the time needed to fill the pool then t*3/5=8 --&gt; t=8*5/3 hours --&gt; to fill 2/5 of the pool 8*5/3*2/5=16/3 hours will be needed).   Or plug values: take the capacity of the pool to be 5 liters --&gt; 3/5 of the pool or 3 liters is filled in 8 hours, which gives the rate of 3/8 liters per hour --&gt; remaining 2 liters will require: time = job/rate = 2/(3/8) = 16/3 hours = 5 hours 30 minutes.   5hr 30minnswer: 5hr 30min.
<result>A</result>
An empty pool being filled with water at a constant rate takes 8hours to fill to 2/5 of its capacity.how much more time will it take to finish filling the pool?