1.  The Red Blades Aerobatic Display Team use white and red smoke trails as part of their flying display.

At the start of the display, each aeroplane holds a tank containing 270 litres of white smoke fluid, and another tank containing 90 litres of red smoke fluid.

A function of the form

$w=\frac{30375}{t+p}-q$

is proposed to model the amount of white smoke fluid remaining in its tank,$w$  litres, after time $t$ seconds of its use. $p$  and $q$ are positive constants.

The white smoke fluid runs out after 6 minutes of use. Find the values of $p$and $q$.