A fish is swimming 9/2 km every 9 minutes. How many kilometres will she swim in 1 hour?
Rate = Distance / Time
Rate = 9/2 km / 9 min ---> 9/2 ÷ 9 = 9/2 x 1/9 = 9/18 = 1 km / 2 min or (1/2) km/min
Distance = Rate x Time
Distance = (1/2) km/min x 60 min = 30 km.
