CAT Exam Numerical Ability

All possible natural numbers are formed by using one or more out of 2, 3 and 7 as their prime factor(s). If none of the formed numbers is divisible by the cube of any natural number greater than 1, what is the sum of all such numbers?

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CAT Other Question

a car A starts from a point P towards another point Q.Another car B starts (also from p) 1 h after the first car and overtakes it after covering 30% of the distance PQ .after that .the car contniue and on reaching Q, Car B reverses and meet car A at 23(1/3) of the distance QP.find the time taken by car B to cover the distance PQ(in hours) six black balls and six white balls of the same size are distributed among 10 urns so that atleat one ball is there in one urn