Find the current flowing in the load of a transmission line?
In part (a) you calculated the current as 1/3 so why should it suddenly be any different to the load current in part (b). As for phase angle, you have shown the line to be a equivalent to a quarter wavelength long at 37.5 MHz so, given the load is resistive, the phase angle of the load current has to be 90 degrees lagging as you have also shown.