To find the length of the rectangular park in Mia's hometown, we need to use the information from the dialogue between JM and Mia.

Area of ​​JM's square park:

Side = 48 m
Perimeter = 4 * 48 = 192 m
According to Mia, if you go around JM's park three times, it is equal to going around Mia's park twice. Therefore:

The perimeter of Mia's park (rectangle) must be:
Mia's perimeter
=
3
2
×
192
=
288
m
Mia's perimeter=
2
3
​
×192=288 m
The formula for the perimeter of a rectangle is:
P
=
2
×
(
d
+
r
)
P=2×(d+r)
Where
d
d is the length and
r
r is the width. We already know the width
r
=
70
r=70 m:

288
=
2
×
(
d
+
70
)
288=2×(d+70)
Divide both sides by 2:

144
=
d
+
70
144=d+70
Solve the equation:

d
=
144
−
70
=
74
m
d=144−70=74 m
So the length of the park in Mia's hometown is 74 m.