The velocity of the rain, \(underset{v_{r}}{rightarrow}\) = 25√3m/sec = \(-25sqrt{3}hat{j}\)
The velocity of the wind, \(underset{v_{w}}{rightarrow}\)= 25m/s = \(25hat{i}\)
The velocity experienced by the person standing on the ground = \(underset{v_{rw}}{rightarrow}\) \(left | underset{v_{rw}}{rightarrow} right |\) = \(sqrt{(25)^{2}+(25sqrt{3})^{2}}\) = 50m/s