The differential pressure transmitter of a flow meter using a venturi tube reads $2.5\times 10^5\;Pa$ for a flow rate of $0.5\;m^3/s$. The approximate flow rate in $m^3/s$ for a differential pressure $0.9\times 10^5\;Pa$ is
- $0.30$
- $0.18$
- $0.83$
- $0.60$