Quantitative Aptitude - Arithmetic Ability Questions

A man travelled at 40 kmph. Had he increased his speed by 16 kmph, he would have covered 80 km more in the same time. Find the actual distance travelled?

The length of the common chord of two intersecting circles is 12 cm. If the diameters of the circles are 15 cm and 13 cm, then what is the distance (in cm) between their centers?

In the following question, select the odd word from the given alternatives.

Sum of a fraction and thrice of its reciprocal is 73/20. What is the fraction?

If x = a + 1a, y = a - 1a ,(a>0), then the value of x4+y4-2x2y2 is

The standard deviation of the set {10, 11, 12, 9, 8} is

The ratio of salary of X, Y and Z is 15 : 3 : 8. If Z gets Rs. 3960 more than Y, then what is the salary (in Rs.) of X?

Which one of the following is true for 0°<θ<90°