Answer: 675 litres
Explanation:
First, we can figure out how many minutes are in an hour and 30 minutes.
1 hr = 60 minutes
30 minutes = 30 minutes
Total time = 90 minutes
Since the hose leaks 15 litres of water every two minutes, we can figure out how many litres of water the hose will leak in 90 minutes by multiplying 15 by 45. We do this because there are 45 groups of 2 minutes in 90 minutes.
15 x 45 = 675 litres