3x+5y=42
9x+7y=78
adding above equation
12x+12y=120
x+y=10
It would round up to 1,244,000
6.25 for each kids ticket and 11.75 for each adult ticket
If it stays as fraction the answer would be 7/14
The formula of a slope:

We have the points (2, 5) and (4, 10). Substitute:

This means that 2.5mm of rain falls every hour