Quantitative Aptitude - Arithmetic Ability Questions

A man can row his boat at a speed of speed of 4 kmph and he finds that the time taken rowing upstream is double to that taken downstream. Find the speed of the stream (in kmph).

If cos ­-11π/6 = x, then the value of x is

If x = 1 – y and x2 = 2 – y2, then what is the value of xy?

On Selling a toy at 20/31 of the marked price there is a loss of 20%. What will be the ratio of marked price and cost price of the toy?

If a = 1/a-5, then the value of a + 1/a = ?

If 3x - 10 = -(2x + 5), then the numerical value of (x - 4)3 is

If the selling price is Rs 2125 after getting a discount of 15% what was the marked price?

The tops of two poles of height 60 metres and 35 metres are connected by a rope. If the rope makes an angle with the horizontal whose tangent is 5/9 metres, then what is the distance (in metres) between the two poles?