Carcass wrote:

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

(A) 5 hr 30 min

(B) 5 hr 20 min

(C) 4 hr 48 min

(D) 3 hr 12 min

(E) 2 hr 40 min

IMPORTANT CONCEPT: After 8 hours, 3/5 of the job is finished and 2/5 of the job is remaining.

This means

the remaining part of the job is 2/3 the size of the first part of the job. Think of it this way:

If the pool had a capacity of 5 gallons, then the first part of the job would be filling 3 gallons, and the remaining part of the job is filling 2 gallons.

So, the remaining part of the job (filling 2 gallons) is 2/3 the size of the first part of the job (filling 3 gallons)

So, if it takes 8 hours to do the first part of the job, then the time to do the remaining part = 2/3 of 8 hours

2/3 of 8 hours = 2/3 x 8 hours

= 16/3 hours

= 5 1/3 hours

= 5 hours 20 minutes

Answer: B

Cheers,

Brent

_________________

Brent Hanneson – Creator of greenlighttestprep.com

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