Quantitative Aptitude - Arithmetic Ability Questions

If 10 people can do a job in 20 days,then 20 people with twice the efficiency can do the same job in

A train is moving at the speed of 72 km/hr. How many seconds will it take to cover a distance of 1400 m ?

The area of a circle is 616 sq cm, find its circumference?

∆PQR is right angled at Q. If m∠R = 45°, then find the value of (cosecP - √3/2)

An equilateral triangle of side 6 cm is inscribed in a circle. Then radius of the circle is

A's salary is 50% more than that of B. Then B's salary is less than that of A by

Rs. 782 is divided into 3 parts in the ratio 12:23:34, the first part is 

A train moves at the speed of 40 m/s and crosses a bridge of length 550 metres in 25 seconds. What is the length (in metres) of the train?