A water fountain flows at a steady rate of $500 \mathrm{~mL}$ every 6 seconds. At this rate, how long will it take to fill a $250 \mathrm{~mL}$ bottle?
(A) $2 \mathrm{~s}$
(B) $9 \mathrm{~s}$
(C) $3 \mathrm{~s}$
(D) $6 \mathrm{~s}$
(E) $1 \mathrm{~s}$
At this rate, it would take 6 seconds to fill a $500 \mathrm{~mL}$ bottle.

A $250 \mathrm{~mL}$ bottle has half the volume of a $500 \mathrm{~mL}$ bottle and so it will take half as long or 3 seconds to fill.

ANSWER: (C)