Quantitative Aptitude - Arithmetic Ability Questions

If a+1b= b+1c = c+1a (a , b, c are not equal) then the value of abc = 

In the given figure, AB = 30 cm and CD = 24 cm. What is the value (in cm) of MN?

A spaceship travels at 810 km/hr. How many metres does it travel in 1/5th of a second?

Two cars travel from city A to city B at a speed of 42 and 60 km/hr respectively. If one car takes 2 hours lesser time than the other car for the journey, then the distance between City A and City B is:

If p/q = r/s = t/u = √5, then what is the value of [(3p2 + 4r2 + 5t2)/(3q2 + 4s2 + 5u2)]?

If x2+1x2 = 2, then the value of x - 1x is

If a-b=1 and a3-b3 = 61, then the value of ab will be

The marked price of an article is Rs. 5000. But due to a special festive offer a certain percent of discount is declared. Mr. X availed this oppurtunity and bought the article at reduced price. He then sold it at Rs. 5000 and thereby made a profit of 11 1/9%. The percentage of discount allowed was?