A car travels a distance of $$x$$ km at a speed of $$5\frac{5}{9}$$ m/sec and returns at 5 m/sec to the starting point. If the total time taken by the car is $$7\frac{3}{5}$$ hours then the value of $$x$$ (in km) is:

A

78

B

72

C

80

D

66