Answer
Explained below.
Work Step by Step
1 mile = 1.609 km = 1.61 km (rounded off)
So, 1 mi/hr = 1.61 km/hr
Therefore, the equivalent scale readings for the empty boxes are :-
0 mi/hr = 0 km/hr,
10 mi/hr=16 km/hr (rounded off),
20 mi/hr=32 km/hr (rounded off),
30 mi/hr=48 km/hr (rounded off),
40 mi/hr=64 km/hr (rounded off),
50 mi/hr=81 km/hr (rounded off),
60 mi/hr=97 km/hr (rounded off),
70 mi/hr=113 km/hr (rounded off),
80 mi/hr=129 km/hr (rounded off),
90 mi/hr=145 km/hr (rounded off),
100 mi/hr=161 km/hr (rounded off).
Also, the speed limit of 70 mi/hr is equivalent to 113 km/hr.
