David walks to a viewpoint and returns to the starting point by his car and thus takes a total time of 2 hours 20 minutes. He would have gained 1 hour by driving both ways. How long would it have taken for him to walk both ways.
Pick:  A) 4 h  B) 3 h  C) 5 h  D) 3 h 20 min  E) 6 h 20 min
1.Walking to to a viewpoint+Driving back=2 hours 20 minutes   2.Driving to a viewpoint+Driving back=2 hours 20 minutes - 1 hours=1 hours 20 minutes, thereforeone way driving=1 hours 20 minutes/2 = 40 minutes.   3. From 1.one way driving=2 hours 20 minutes-40 minutes=1 hour 40 minutes.   4.Walking to to a viewpoint+Walking back=1 hours 40 minutes+1 hours 40 minutes=3 hours 20 minutes.   Answer: 3 h 20 min
<result>D</result>
David walks to a viewpoint and returns to the starting point by his car and thus takes a total time of 2 hours 20 minutes. He would have gained 1 hour by driving both ways. How long would it have taken for him to walk both ways.