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GMAT - Problem Solving - Time and Work

An empty pool being filled with water at a constant rate takes 8hours to fill to 3/5 of its capacity.how much more time will it take to finish filling the pool?

An empty pool being filled with water at a constant rate takes 8hours to fill to 3/5 of its capacity.how much more time will it take to finish filling the pool?

A. 5hr 30min
B. 5hr 20min
C. 4hr 48min
D. 3 hr 12min
E. 2hr 40 min

Time taken to fill 3/5th of the pool = 8 hours = 480 minutes

Rate of filling the pool per minute = volume filled / time taken = (3/5) / 480 = 1/800 per minute

Time taken to fill the complete pool = 1/rate = 800 minute

time left = 800 - 480 = 320 minutes

= 5 hours 20 minutes

B is correct