Question

How do you do Rate problems 2?

Answer 1

It wants an average. So 30 MPH +12 MPH ÷ 2 which represents the 2 directions. Equal 21 MPH

Answer 2

D = rt
Uphill
d = 10(12/60) d = 2 miles (12/60) represents part of an hour

Downhill
2 = 30t
2/30 = t 1/15 = t 1/15 of an hour = 4 minutes

Average speed = total miles covered/total time
total distance = 4 miles
total time = 4 minutes + 12 minutes = 16 minutes/60 = 4/15 of an hour
4/(4/15) = 15 mph