Answer:
78.6 km/h
Step-by-step explanation:
Each year, the maximum speed is multiplied by (1 - 7%) = 0.93. After 5 years, the speed has been multiplied by that factor 5 times, so has been multiplied by 0.93^5. The maximum speed is then ...
(113 km/h)(0.93^5) ≈ 78.6 km/h