Question $1$

$5$ pts

At a particular time the storage in a river reach is $1$ millions $f{t}^3.$ At that instant, the inflow into the reach is $400$ cfs and the outflow is $500$ cfs$.$ After $1$ hours, the inflow and outflow are $600$ cfs and $800$ cfs$,$ respectively.

Determine the change of storage during $1$ hours

$540000f{t}^3$

$-540000f{t}^3$

$54000f{t}^3$

$-54000f{t}^3$