Answer: 
Explanation:
Given
Car drives 215 km east and then 45 km North
Displacement is East direction is

Now, the displacement from that to 45 km North is given by

Net displacement is 

Magnitude of the displacement is

Your answer is a new experiment, since it's something that hasn't been tried before, or has, but resulted in with lots of errors.
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Answer: 2.22s
Explanation: wave speed = 450 m/s, A = amplitude = 1.6mm, λ= wavelength = 0.19m
Wave speed = distance traveled / time taken
Distance traveled = 1km = 1000 m
450 = 1000/ t
t = 1000/ 450 = 2.22s
Energy that transfers through the medium