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If (x + 1/x) = 3, then (x2 + 1/x2) is equal to :

C. 7
Posted in:  Basic Operations & Factorization -  Algebra -  Mathematics

Bombay Express Left Delhi from Bombay at 14.30 hrs, travelling at a speed of 60 kmph and Rajdhani Express left. Delhi for Bombay on the same day at 16.30 hrs, travelling at a speed of 80 kmph. How far away from Delhi will the two trains meet?

A. 480 KM
Posted in:  Time, Distance and Speed -  Aptitude -  Mathematics

Walking (6/7)th of his usual speed, a man is 12 minutes too late.
The usual time taken by him to cover that distance is:

A. 1 HR 12 MIN
Posted in:  Time, Distance and Speed -  Aptitude -  Mathematics

If x + y = 7 and xy = 6,
the value of (x3 + y3) is : 

C. 217
Posted in:  Basic Operations & Factorization -  Algebra -  Mathematics

If x + y + z = 9  &  xy + yz + zx = 23,
then the value of (x3 + y3 + z3 - 3xyz) is :

A. 108
Posted in:  Basic Operations & Factorization -  Algebra -  Mathematics