Answer:
x= 4.3125
Step-by-step explanation:
2^2 = 16x - 65
4= 16x- 65
+65 +65
69 = 16x
69/16 =16x/16
4.3125 = x
the answer is three digits because the answer is 157.136
average speed for walking = 4.5 km/h
average speed for cycling = 23.2 km/h