Using the approximate conversion factors in Table 1.5, convert the following to SI units without using your calculator.

Table 1.5 

1 cm ≈ 1/2 in

10 cm ≈ 4 in

1 m ≈ 1 yard

1 m ≈ 3 feet

1 km ≈ 0.6 mile

1 m/s ≈ 2 mph

a. 20 ft

b. 60 mi

c. 60 mph

d. 8 in