Electric field due to two charges on line joining them

A charge $Q_2=4.0\text{nC}$‍ is placed at a distance of $r^{\prime }=10\text{m}$‍ away from another charge $Q_1=18\text{nC}$‍ as shown below.

Find the electric field at the point $\text{P}$‍ which is at a distance of $r_1=6.0\text{m}$‍ from $Q_1$‍.$\begin{array}{rl}& \\ & \end{array}$‍ Note: Report your answer correct to two significant figures.

${\displaystyle \frac{\text{N}}{\text{C}}}$‍ towards .