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Find dy/dx using implicit differentiation ln(20+e^xy)=y

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

What is the measure of angle x? a.101 b.158 c.44 d.79