Question: Hi, I was wondering how I would do this calculus question. Two cars leave an intersection, one 25 minutes after the other. The first car,

Hi, I was wondering how I would do this calculus question.

Two cars leave an intersection, one 25 minutes after the other. The first car, A, travels north at the speed of 50 km/h and the second car, B, travels west at a speed of 70 km/h. How fast are the cars separating from each other 45 minutes after the first car leaves the intersection?

I believe m suppose to come up with an equation using c^2=a^2+b^2 and then my teacher says im suppose to use implicit differentiation since there willl be 3 variables in my final equation but im still confused? the actual answer is 79km/h

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