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During a trip of \(200\) kilometers, Stella covers the first \(80\) kilometers at an average speed of \(x\) kilometers per hour and the remaining distance at an average speed of \(x + 15\) kilometers per hour. If her average speed for the entire trip is \(\dfrac{250}3\) kilometers per hour, what is the value of \(x?\)
A. \(\dfrac{223}3\)
B. \(75\)
C. \(\dfrac{455}6\)
D. \(80\)
E. A unique value cannot be determined
Answer: B
Source: e-GMAT
A. \(\dfrac{223}3\)
B. \(75\)
C. \(\dfrac{455}6\)
D. \(80\)
E. A unique value cannot be determined
Answer: B
Source: e-GMAT
