In a 4 km race, A wins by 600m to B. B can give a start of 200 m to C. By how much distance, C gets start so that the race between A and C ends in dead heat.

770 m

    A   :   B    :   C

4000  : 3400

            4000 :  3800

1600 : 1360 : 1292

   ↓ X 2.5            ↓

4000                 1292 X 2.5 = 3230

Thus,  C gets a start of 770m