Q) Check whether the equation λ=h/m²v^-1 is dimensionally correct ( λ= wavelength , h=Planks constant m= mass, v=velocity )

The pilot of a helicopter hovers at an altitude of 1200 feet over a park. the angle of depression to the base of a statue is 17 degrees. the angle of depression to the nearest park exit, in line with the statue, is 14 degrees. to the nearest foot, what is the distance from the statue to the exit?