You walk one mile to school every day. You leave home at the same time each
day, walk at a steady speed of 3 miles per hour, and arrive just as school begins. Today you
were distracted by the pleasant weather and walked the rst half mile at a speed of only 2
miles per hour. At how many miles per hour must you run the last half mile in order to arrive
just as school begins today?
Choose the correct choice:
A) 4 miles per hour B) 6 miles per hour C) 8 miles per hour D) 10 miles per hour E) 12miles per hour
Recall the formula s = v t, where in this case, s is distance (in miles) traveled at a   constant speed of v (miles per hour), for a time of t hours. The rst statement indicates that   it usually takes you only 20 minutes to go to school (solve for t in 1 = 3 t and change units)   Today, it took you 15 minutes to cover the rst half mile (solve for t in 1=2 = 2 t and   change units). You only have 5 more minutes to arrive (that is 1/12th of an hour), and need   to cover another half mile. Solve for v in the equation 1=2 = (1=12) v.   correct answer 6 miles per hour
<result>B</result>
You walk one mile to school every day. You leave home at the same time each
day, walk at a steady speed of 3 miles per hour, and arrive just as school begins. Today you
were distracted by the pleasant weather and walked the rst half mile at a speed of only 2
miles per hour. At how many miles per hour must you run the last half mile in order to arrive
just as school begins today?