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If A can do a piece of work in 20 days and B can do it in 30 days, how long will it take for both A and B to complete the work together?

B. 15 DAYS
Posted in:  Time & Work -  Aptitude -  Mathematics

If a person walks at a speed of 4 km/h, how long will it take to walk 10 km?

B. 2.5 HOURS
Posted in:  Time, Distance and Speed -  Aptitude -  Mathematics

If x = 5, what is the value of 3x^2 - 2x + 1?

A. 66
Posted in:  Numbers -  Arithmetic -  Mathematics

For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k?

C. K ? -4
Posted in:  Quadratic Equations -  Algebra -  Mathematics

If the roots of the quadratic equation 2x² + 3x + k = 0 are real and equal, what is the value of k?

A. -4.5
Posted in:  Quadratic Equations -  Algebra -  Mathematics