X and Y start at the same time to ride from place A to place B, which is 80 km away from A. X travels 4 km per hour slower than Y. Y reaches place B and at once turns back meeting X, 16 km from place B. Y’s speed (in km/h)is:

12

According to question ,

Ratio of                 Y          :              X

Distance        ( 80 + 16 )    :       ( 80 - 16 )

                           96          :            64

                             3          :              2

Speed                    3          :              2

(3-2)R = 4 km/h

So , Speed of Y = 3 × 4 = 12 km/h