50 points!!!!

Please answer the below questions...


1. Two quantities (a and b) vary inversely, if a =3/5 , b=10/9. If a=14/15, then b= ?

2. Deepa made a cuboidal box of volume 8000m³. She found it too big and reduced its height by 5cm. Does the box continue to be a cube? Find the dimensions and the volume of the new box

3. If PQ || RS , PS || QR , PQ=5cm , QR=3cm , and /_ Q= 60°, it becomes a _________ (quadrilateral)​