Directions: Read the below passage and answer the questions that follow:
Boat A is going ___(1) __ at a speed of ___(2) __ km/hr from point A in a stream of speed ___(3) __ km/hr thus the speed of boat in still water is ___(4) __ km/hr. After travelling a distance of ___(5) __ in ___(6)__ hours it reaches point B it turns around and reaches the starting point in ___(7) __ hours. When the boat A leaves point A, boat B at point B starts travelling ___(8) __.
If (1) is upstream and (3) is 3 and (4) is 30, what is (5) if (6) is 12

Options

A. 324 km
B. 360 km
C. 396 km
D. 432 km