Quantitative Aptitude - Arithmetic Ability Questions

Car B is running twice as fast as car A. If car A covers a distance of 90 km in 1 1/2 hrs, what is the speed of car B?

The marked price of an article is 60% more than its cost price. If the article is sold for Rs 300 after offering a discount of Rs 20, then what will be the profit percentage?

If x = √2+1, then the value of x4-1/x4

If the perimeter of a semi-circle is 108 cm, then find its radius (in cm).

The point Q(a,b) is first reflected in y­axis to Q1 and Q1 is reflected in x­axis to (­6,2). The co­ordinates of point Q are

If P = 7 + 4√3 and PQ = 1, then what is the value of 1/P2 + 1/Q2?

In each question two equations numbered I and II are given,you haveto solve both the equation and choose the correctanswer.

I. x2+ 30x + 81 = 0

II.y2-9y -162 = 0

If a+b+c = 0, then (a^3 + b^3 + c^3)^2 = ?