" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
1/9= 1/s + 1/18
1/9 — 1/18 =1/s
2 — 1/18 =1/s
1/18 = 1/s
s = 18 cm