Answer:
Rollerskates: 9 miles/hr
Bike: 17.5 miles/hr
Step-by-step explanation:
How fast→ referring to speed
Speed= distance/ time
Rollerskates:
Distance= ¾ mile
Time= 5 mins
Since the question wants the speed to be in miles per hour, convert the time from minutes to hours.
60 mins= 1 hr
1 min= 1/60 hr
Time= 5/60 hr
Speed
[tex] = \frac{3}{4} \div \frac{5}{60} \\ = \frac{3}{4} \times \frac{60}{5} \\ = 9 \: miles/hr[/tex]
Bike:
Distance= 3.5 miles
Time
= 12 mins
= 12/60 hr
= ⅕ hr
Speed
= distance ÷ time
= 3.5 ÷ ⅕
= 3.5 ×5
= 17.5 miles/hr
