Can someone please help me??

10/9

Step-by-step explanation:

Common denominator is 9, 1*3/3*3 = 3/9, 3/9 + 7/9 = 10/9

If we want to calculate the time it takes to fill a water tank, we need the flow and volume of the tank.
 The flow must be a data, but for the volume of the tank we need mathematics.
 For example, if it is a cylinder, we need mathematics to know that the volume of the cylinder is:
 V = pi * r ^ 2 * h