Answer:
Sam's speed is about 10.3 mi/h.
Step-by-step explanation:
Sam's speed is about 10.3 mi/h.
Step-by-step explanation:
Use dimensional analysis.
Determine the equality between miles and feet, and hours and minutes.
1 mi=5280 ft
1 h=60 m
Each equality can make two conversion factors, which are equal to one.
1 mi
5280 ft
=
1
=
5280 ft
1mi
1 h
60 min
=
1
=
60 min
1 h
Multiply the given value by the conversion factor that has the desired unit in the numerator. This will leave you with the desired unit, and the undesired unit in the denominator will cancel.
Convert feet to miles.
63756
ft
×
1
mi
5280
ft
=
12.075 mi
Convert minutes to hours.
70
min
×
1
h
60
min
=
1.167 hour
Divide miles by hours.
12.075
mi
1.167
h
=
10.3 mi/h