.632
step-by-step explanation:
6 * 1/10 = 3/5
3*0.01 = 0.03
3/5 + 0.03 = .63
2*0.002 = .002
.63 + 0.002 = .632
4a. is 3 miles every hour
4b. is 1/3 of an hour per mile
2 2/3 hours duhh silly