Hydrology - at a particular area, the storage in a river reach is 450m3/hrs. the inflow at that time

... was measured to be 200m3/s and the outflow is 300m3/s.the inflow after 4 hrs was measured to be 260m3/s and the outflow was 270m3/s. determine:
a.the change in storage during the elapsed time
b.the final storage volume