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From A to B (Posted on 2002-05-15) Difficulty: 5 of 5
A car drives downhill with the speed of 90 m/h. On a level road, the same car goes 72 m/h, and uphill it goes "only" 60 m/h.

It takes this car 5 hours to go from town A to town B. The return trip only takes 4 hours.

Find the distance between the two towns.

See The Solution Submitted by levik    
Rating: 3.8667 (15 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Alternate approach | Comment 7 of 14 |
(In reply to Alternate approach by TomM)

not like anyone will ever go this far back in the posts but,

an even more simplified version. Realize that 90/(hill) = 60/(hill) - 1. (well in my units anyways - 90 and 60 are the mph speeds, hill is the length of the graded section in miles, and 1 is the time difference in hours). This will let you calculate the length of the hill, from which point its pretty easy to finish.
  Posted by Cory Taylor on 2002-11-25 05:01:05

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