Heather is filling her new koi pond with a water hose. after 33 minutes, her pond has 74 gallons water. her koi pond holds 480 gallons of water. she adds another water hose that flows twice as fast. find the constant of proportionality that relates the current flow rate? (round to nearest tenth) a) 2.2 b) 4.5 c) 6.7 d) 9.0