78. Two friends start running in an opposite direction from the same point. One friend runs 2km/h faster than the other. After one hour, they are 10 km apart. What is the speed of both friends:

(A) 2 km/h and 6 km/h 

(B) 4 km/h and 6 km/h 

(C) 4 km/h and 8 km/h 

(D) 3 km/h and 6 km/h 

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