Question

Fernando is walking home from a friend's house at a constant speed. After 2 minutes he is 4 miles from home. 12 minutes after leaving, heis 1 miles from home.What is his rate in miles per hour (mph)?

Answer 1

Speed rate = distance / time

Distance 1 = 4 miles

time 1 = 2 minutes

Distance 2 = 1 mile

Time 2 = 12 minutes

Time difference : (12-2 ) = 10 minutes

Distance = 4-1 = 3 miles

speed rate = 3 miles / 10 minutes = 0.3 miles per minute

To obtain it in miles per hour:

10 min / 60 = 1/6 hours

rate = 3 miles / (1/6 ) hours = 18 miles per hour