Pamela rides her bicycle to work at the speed of 8 km/hr and reaches her office at 9 AM. When she rides her bicycle

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Pamela rides her bicycle to work at the speed of 8 km/hr and reaches her office at 9 AM. When she rides her bicycle at the speed of 12 km/hr, she reaches her office at 7 AM. At what speed must Pamela ride her bicycle so that she can reach her office at 8 AM?

A. 8.8 km/hr
B. 9.6 km/hr
C. 10.0 km/hr
D. 11.2 km/hr
E. 11.8 km/hr
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