Question 1135332
By drawing the described figure, a right triangle is found with a hypotenuse RT, having a length {{{7-3=4}}} meters opposite the 30 degree angle.  This is a special 30-60-90 triangle, being HALF of an equilateral triangle; and RT is therefore {{{4*2=highlight(8)}}} meters.


Some of the description seems a little unclear; but there is also another right triangle involving P and R, of legs  20 m and 3 m.