The solution is (-2,4) she right both have the same solution because if you solve both of them you will get (-2,4)
A=600⋅(1.0001)^365t
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We Know, speed = Distance / Time
Here, Distance = 2748 miles
Time = 6 hours
Substitute their values in to the expression,
Speed = 2748 / 6 = 458 Miles / Hour
So, the speed would be: 458 miles/hour
Hope this helps!