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t stands for time in seconds x and y stand for distances so to calculate the speed you need get the derrivative equations of f(t,x) and f(t,y) then you will be able to find the speed in both the x and y directions and use the pythagoras theorem to find the speed of the object.

Homework Statement Finding the enthalpy of water with the following known data: Water, temperature 45 degrees, pressure 1.2 bar Homework Equations Q' = m'(steam) * h(gas) - m'(steam) - h(fluid) The Attempt at a Solution I need to find the enthalpy of water under the circumstances...