A train covers a distance between station A and station B in 75 minutes.  If the speed of the train is reduced by 6 km/h, then the same distance is covered in 80 minutes.  The distance between stations A and B is?

120 km

A                            B

._________________.

Time       75     :     80

              15     :     16

Speed     16     :     15

                ↓    1R → ×6 → 6 km/h

               ×6

                ↓ 

              96 km/h

Distance between A & B = 96 × 75 minutes = 96 × \(\frac{5}{4}\) = 120 km