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Algebra Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Kerry and Karen are driving to meet each other. They both leave home at mid-day and both drive at the same constant speed. At 1 pm they are 200 km apart by road. At 2:15 pm they are 100 km apart. How far apart by road do Karen and Kerry live?

(A) $360\text{ km}$ (B) $320\text{ km}$ (C) $280\text{ km}$ (D) $260\text{ km}$ (E) $240\text{ km}$

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