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For The Mathematically Inclined

Anil Saigal

A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass another 3 hr. later. What are their speeds!

What is the sum of 1 -0.5 +0.25 -0.125 +0.0625 ......?


Please send your solutions to mr.asaigal@gmail.com.

Use Problem Solutions M-051012 as the subject line. Please include your full name in the text of the main message. Everyone with the right answer will be acknowledged in the next issue of Lokvani.

Please do not post your solution in Post Comments. No credit will be given for solutions not sent to anil@lokvani.com.

If you need clarification on any problem, please contact anil@lokvani.com.


Problems from 04/26/12

Point A (5,0) is rotated 90 degrees about the origin. What are its new coordinates.


Point A (5,0) is rotated 90 degrees counter-clock wise about point B (1,1). What are its new coordinates.


Congratulations to Aseem Chandawarkar, Kishore Balsara, Suhas Joglekar and Suhas Pathak, who were the winner of the last set of puzzles.

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