To get to work, you drive for 20 minutes at 30 mph, and walk 10 more minutes at 3 mph. what was your average speed?
a.16.5 mph
b.20 mph
c.21 mph
d.23 mph submit
20 min at 30 mph = 10 miles 10 min at 3 mph = .5 miles So, in 30 minutes you travel 10.5 miles In one hour, you would travel 21 miles. Therefore, your average speed was 21 mph. Answer is c.
