Quantitative Aptitude - Arithmetic Ability Questions

Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?

One of the two inlet pipes works twice as efficiently as the other. The two, working alongside a drain pipe that can empty a cistern all by itself in 8 hours, can fill the empty cistern in 8 hours. How many hours will the less efficient inlet pipe take to fill the empty cistern by itself?

If y=2secθ and x=3tanθ then x29-y24 is

Working 10 hours a day, Aman can complete a piece of work in 18 days. How many hours a day should he work so as to finish the work in 15 days?

X can do a piece of work in 'p' days and Y can do the same work in 'q' days . Then the number of days in which X and Y can together do that work is

Two fractions are such that their product is ­4 and sum is ­32/15. Find the two fractions.

A train travelling at 76 kmph crosses a 450 m long platform in 27 seconds. What is the length of the train?

What is the perimeter of the sector whose central angle is 60° and radius of the circle is 21 cm?