It is 45/1.
100 cm = 1 metre so 45 cm = 45/100 metre = 9/20 m
200 m /1 km = 200 m/1000 m = 1/5
1/45 m/s
0.3048 m = 1 ft (exactly) 1 sq ft = 1 ft x 1 ft = 0.3048 m x 0.3048 m = 0.30482 sq m → 45 sq m = 45 ÷ 0.30482 sq ft ≈ 484 sq ft
It is: 1/1000
1/1000
It is: 1/1000
1/100
1/1000
1/2 m
Since 100 m is less than 1 km, the relevant fraction has an absolute value less than 1 and so there is no equivalent vulgar fraction.