PROBLEM # 2
12 black mice and 1 white mouse are in a ring. Where should a cat start so that if he eats every 13th mouse the white mouse will be last?

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Problems from 05/10/12

PROBLEM #1
A freight train and an express train leave towns 390 km apart, traveling toward one another. The freight train travels 30 km per hr slower than the express train. They pass another 3 hr. later. What are their speeds!

SOLUTION 1
50 and 80 kph.

PROBLEM #2
What is the sum of 1 -0.5 +0.25 -0.125 +0.0625 ......?

SOLUTION 2
2/3.

Congratulations to Anindya Basu, Kishore Balsara, Prabhakar Nadkarni, Priya Linson, Suhas Joglekar and Suhas Pathak, who were the winner of the last set of puzzles.