Answer:
45 miles per hour.
Step-by-step explanation:
A car travelled 990 feet in 15 seconds.
1 mile = 5280 feet
? miles = 990 feet
Cross multiplying gives;
[tex]\frac{990}{5280}[/tex] miles
1 hr = 3600 seconds
? hrs = 15 seconds
Cross multiplying gives;
[tex]\frac{15}{3600}[/tex] hrs
Speed = Distance travelled ÷ time
Speed (in miles per hour) = [tex]\frac{990}{5280}[/tex] miles ÷ [tex]\frac{15}{3600}[/tex] hrs
= [tex]\frac{990}{5280}[/tex] miles × [tex]\frac{3600}{15}[/tex] miles = 45 miles per hour
