Ankur finishes a journey by car in 6 hours . He travels the first half of the journey at a speed of 30 km/h and the second half of it at a speed of 60 km/h . The total distance covered is :

240 km

                             ( 1st half )       ( 2nd half )

ratio of   Speed             30        :        60

             Speed               1        :        2     

    Distance = Speed × Time

  Speed is inversely proportional to Time 

                             ( 1st half )       ( 2nd half )

              Time               2         :        1           

      ( 1 + 2 )R =  3R  →  6 hours

                         1R  →  2 hours

Distance at the speed of 30 km/h = 30 × 4 = 120 km

                            Total Distance = 120 × 2 = 240 km