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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: pure algebra | Comment 4 of 14 |
I also arrived at y = 144 - 2x. This gives a total distance of 180 miles uphill (A to B), 144 miles level, and 0 miles downhill. This gives a total distance of 324 miles.
  Posted by Ender on 2002-05-16 03:09:06
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