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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

Respuesta :

wolf1728
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.



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