Question

Which speed is the fastest? A 18 feet in 20 minutes B 90 feet in 2.5 hours C 20 yards in 1.5 hours D 3 2/3 yards in 15 minutes

Answer 1

To solve, put each answer in terms of ft/min. Do this by converting all distances to feet and times to minutes, the dividing feet by minutes. A) $18/20=9/10$ ft/min. B) To get 2.5 hrs to mins, multiply by 60. $2.5*60=150$   $90/150=3/5$ ft/min. C) To get feet from yards, multiply yards by 3. $20*3=60$   $1.5*60=90$   $60/90=2/3$ ft/min. D) $(11/3)*3=11$   $11/15=11/15$ ft/min. Now compare the fractions to determine the largest and fastest is 9/10 ft/min, or A.