Mr. walker was hiking across massachusetts. he has three days to cover 70 miles. on the first day, he walked 6 hours at a speed of 4 mph. on the second day he walked the same number of hours, but his speed was only 3 mph. on the third day, he walked 8 hours to cover the remaining distance. what was his speed on the third day?

So 6 hours at 4 miles per hour
4 miles per hour means 4 mieles in one hour
6 hours
distance=time times (distance pers unit of time)
distance=6 times 4=24

second day
same number of hours=6
speed=3

distance=time times (distance per units of time)
distance=6 times 3=18

so we add 1 and 2 days together
24+18=42
so he has covered 42 mles
he eed to cover 70
70=42+rest
subtract 42
28=rest

so he traveled 28 miles on third day
in 8 hours
sppeed=distance divided by time
time=8
distance=28
28/8=14/4=7/2=3 and 1/2 miles per hour=3.5 miles per hour

answer is 3.5 miles per hour