Quantitative Aptitude - Arithmetic Ability Questions

If y=2-x1+x, then what is the value of 1y+1 + 2y+1y2-1 ?

A boat is sailing towards a lighthouse of height 20√3 m at a certain speed. The angle of elevation of the top of the lighthouse changes from 30° to 60° in 10 seconds. What is the time taken (in seconds) by the boat to reach the lighthouse from its initial position?

Meghnad can do a piece of work in 45 hours. If he is joined by Jayshri, who is 50% more efficient, in what time will they together finish the work?

Reflection of the point (2,­7) in the y­axis is

Product of 6ab, 3b and 4a is

A helicopter, at an altitude of 1500 m, finds that two ships are sailing towards it, in the same direction. The angles of depression of the ships as observed from the helicopter are 60° and 30°respectively. Distance between the two ships, in metres is

The price of an article is cut by 7%, to restore it to its original value, the new price must be increased by

If cosAcotA/(1 -­ sinA) = x, then the value of x is