The question doesn't seem to be written correctly, I'm not able to make much sense of it.
Step-by-step explanation:
derivative of cos(x) is -sinx
$50.08, I think. Because you can substitute 3x = $75.12 and solve for x
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Answer : Kamala
Speed = distance/time
For John : speed = 30/1.5 = 20 km/h
For Kamala : speed = 42/2 = 21 km/h Thus Kamala has a greater average speed than John.
Hope it helped!
