Let the runs scored by Rahul be "x" and that by Sachin be "2x"
When they played together , their score together was two less than double century. Double century = 200 score.
Hence , they together scored two less [ 200 -2 = 198] than double century :-
x + 2x = 198
3x = 198
x = 66
Runs scored by Rahul = x = 66
Runs scored by Sachin = 2x = 132