(It's almost impossible to read, so I can't say for sure, and the bottom graph is cut off)
Step-by-step explanation:
The clue is that he used very little water in September, so the graph where the line goes down in September is the best choice. The months of June and July should have the line higher since he used more water during those dry months.
To get the result we can use knowledge that reading is 2 times longer than HW. To find this value we just have to multiply 42 times 2 so 40*2=80 Its 1 hour and 20 min - its the result
