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A to B (Posted on 2004-03-10) Difficulty: 2 of 5
You need to go from point A to point B, and then back to point A. Points A and B are 20 miles apart. You go to point B at a constant speed of 15 miles per hour. If you want your overall speed to be 30 miles per hour, how fast would you have to go from point B back to point A?

See The Solution Submitted by ethan    
Rating: 1.8182 (11 votes)

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Solution Solution | Comment 3 of 15 |
From point A to point B and back again is 40 miles. To cover 40 miles at 30 mph, you must travel that distance in  40/30 hour.
 
Going from A to B (20 miles) at 15mph will take you (20/15) hour.
 
40/30-20/15= 0
 
You must travel from B to A at infinite speed. 

  Posted by Penny on 2004-03-10 08:49:39
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