What are the absolute pressure and the gauge pressure required in the main water lines, so that water from a firehouse can reach a height of $30 \mathrm{m}$?

The reading of a pressure meter attached with a closed water pipe is $3.5\times {10}^5 \mathrm{N}/{\mathrm{m}}^2.$ On opening the valve of the pipe, the reading of pressure meter reduces to $3\times {10}^5$ $\mathrm{N}/{\mathrm{m}}^2.$ Calculate the speed of water flowing in the pipe.

Density = $1000 {\text{Kg/m}}^3$
(Hints- Use Bernoulli's equation)