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September 20, 2014

September 20, 2014

Posted by **john** on Monday, July 23, 2012 at 12:00am.

- math -
**Reiny**, Monday, July 23, 2012 at 8:37amlet his speed be x mph

time for first trip = 18/x

time for 2nd trip = 23/x

23/x - 18/x = 1

5/x=1

x = 5 mph

check:

to go 18 miles at 5 mph takes 3.6 hrs

to go 23 miles at 5 mph takes 4.6 hrs, which is 1 hour more

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