Answer:
0.89 m is the answer
Explanation:
the wall, the ground and portion of pipe form a right angle triangle with pipe portion being the hypotenuse.
for a right triangle

here we have base = 3m and height = 2m.
thus

portion of pipe overhanging = 4.5 - sqrt (13)
= 4.5 - 3.61
= 0.89 m