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Fantastic! Using \(v_{\text{XE}} = 40\) and \(v_{\text{EY}} = - v_{\text{YE}} = -30\) in \(v_{\text{XY}} = v_{\text{XE}} + v_{\text{EY}}\), we get \(v_{\text{XY}} = 40 + (-30) = 10\)
What is the velocity of Car X wrt Car Y in this scenario in \(\mathrm{km/h}\)? Remember Car X is moving at \(40 \, \mathrm{km/h}\) wrt the Earth and Car Y is moving at \(30 \, \mathrm{km/h}\) wrt the Earth.

\((-40) + (-30)\)

\(40 + 30\)

\((-40) + 30\)

\(40 + (-30)\)