Quantitative Aptitude - Arithmetic Ability Questions

Iftan 450=cot∅, then the value of ∅, in radians is 

Two cars travel from city A to city B at a speed of 60 and 108 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?

A 800 metres long train is running at the speed of 90 km/hr. If it crosses a bridge in 50 seconds, then what is the length (in metres) of the bridge?

Six year ago Parvez’s age was same as the present age of Manish. If the present age of Parvez is one-fourth more than that of Manish's present age, then in how many years will Parvez’s age become double of Manish’s present age?

If Cot θ = 21/20, then what is the value of Cosec θ?

If x + 3y - 2z4 = 6, x + 232y + 3z = 33 and 17x + y +z + 2z =9, then what is the value of 46x+ 131y ?

If 2x- 3(4-2x) < 4x - 5 < 4x + 2x/3, then x can take which of the following values?

What should be added to 8(3x - ­4y) to obtain 18x ­- 18y?