Suppose you run 5miles from your house to a friend's house at a speed of 7miles per hour. When the time comes to return home, you are tired and walk...

Suppose you run 5miles from your house to a friend's house at a speed of 7miles per hour. When the time comes to return home, you are tired and walk the same 5miles home at 2miles per hour. Complete parts (a) through (d) below.

a. How long did you spend running to your friend's house?     hour(s)