At the air show, Amelia sees a jet heading south away from her at a 42-degree angle of elevation. Twenty seconds later the jet is still moving away from her, heading south at a 15-degree angle of elevation. If the jet's elevation is constantly 6.3 km, how fast is it flying in kilometers per hour?

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a So Chang Speed tan 4 Zt 42 L 63 Aus di Da is 4... View the full answer