Jillian drives along a straight road that goes directly from her house (J) to her Grandfather’s house (G). Some of this road is on flat ground and some is downhill or uphill. Her car travels downhill at 99\:km/h, on flat ground at 77\:km/h, and uphill at 63\:km/h. It takes Jillian 3 hours and 40 minutes to drive from J to G. It takes her 4 hours and 20 minutes to drive from G to J. The distance between J and G, in km, is
Answer Choices
A. 318\frac23
B. 324
C. 308
D. 292\frac35
E. 292\frac19