Question

A pool is draining at a constant rate. Five minutes ago, the pool had 180 gallons of water in the pool. Now there is 120 gallons of water remaining in the pool. If the pool can hold 270 gallons of water, how many minutes ago was the pool full?

A. 7 minutes ago

B. 7.5 minutes ago

C. 12 minutes ago

D. 12.5 minutes ago

Answer 1

Answer:

i think your answer will be a) but please once

Answer 2

At current time pool contains 120 gallons, 5 min before it had 180 gallons.

so in 5 min water drained is 180-120=60 gallons

therefore in 1 min water drained=60/5=12 gallons

water drained till current time=270-120=150 gallons

time taken =150/12=12.5

Therefore pool was full 12.5 min ago.