Question

Joe rode from his house to a store at an average speed of 30 kilometers per hour. He walked back along the same route at an average speed of 2 kilometers per hour. If his total traveling time was 2 hours, what is the one- way distance from Joe's house to the store in kilometers?

Answer 1

\[\frac{d}{30}+\frac{d}{2}=2\] that is, time going plus time returning, using time is distance divided by rate. solve for d

Answer 2

first maybe add the fractons get
\[\frac{d+15d}{30}=2\]
\[\frac{16d}{30}=2}\]
\[16d=60\]
\[d=60\div 16=\frac{15}{4}=37.5\]

Answer 3

oops
\[\frac{16d}{30}=2\]

Answer 4

and also
\[\frac{15}{4}=3.75\] not what i wrote