(4) A pipe line carrying oil (sp. gr. 0.8) changes in diameter from 300 mm at position 1 to 600 mm diameter at position 2 which is 5 metres at a higher level. If the pressures at positions I and 2 are 100 KN/m and 60 kN/m respectively and the discharge is 300 litres/sec., determine: (DLoss of head, and (ii) Direction of flow.