The speed of a boat in still water is 8 km/h. If the speed of the stream is 2 km/h, then what distance will the boat cover in 2 hours against the current?

Speed of boat in still water = 8 km/h, stream speed = 2 km/h. Against the current (upstream), effective speed = 8 - 2 = 6 km/h. In 2 hours, distance covered = speed × time = 6 × 2 = 12 km. The key concept is that upstream speed equals boat speed minus stream speed, while downstream speed equals boat speed plus stream speed. This problem tests understanding of relative motion in streams.