For the following questions answer them individually
P, Q and R can finish a work in 5 days, 10 days, and 15 days, respectively, working alone. P and Q works on first day, P and R works on second day and P and Q works on third day and son on till the work is completed. In how many days the work will be completed?
A goods train 350 m long passes through a tunnel of length 1250 m in 80 seconds.
What is the speed of the train?
If one of the interior angles of a regular polygon is $$\frac{15}{16}$$ times of one of the interior angles of a regular decagon, then find the number of diagonals of the polygon.
If a $$\cot \theta + b \cosec \theta = p$$ and $$b \cot \theta + a \cosec \theta = q$$ then $$p^{2} - q^{2}$$ is equal to __________.
PQRS is a cyclic quadrilateral. If $$\angle P$$ is three times of $$\angle R$$ and $$\angle S$$ is four times of $$\angle Q$$, then the sum of $$\angle S + \angle R$$ will be:
Working for 10 hours per day, 6 men can build a wall in a certain number of days. By working for how many hours/minutes per day can 12 men build the wall in the same days?