k = 
using the ' laws of logarithms '
log x - log y = log (
)
logx = logy ↔ x = y
logk - log(k - 2) = log5
log (
=log 5
= 5
5(k - 2) = k
5k - 10 = k
4k = 10 ⇒ k =
= 
Answer:
We have to travel 26.93 units from platform B to C.
Step-by-step explanation:
Length of a segment having coordinates
and
is determined by the formula,

From the graph attached,
Coordinates of the points B and C are (-25, -20) and (-15, 5) respectively.
Distance between these points B and C Or length of BC will be,
BC = 
= 
= 
= 
= 26.93 units
Therefore, we have to travel 26.93 units from platform B to C.
I would answer the problem but first upload the diagram
5^2+8^2=X^2
25+64=X^2
89=X^2
SQUARE ROOT OF 89=X
X=9.4