PROBLEM # 2
I on a train. I see a truck that is going on a parallel road in the opposite direction and passes my window in 6 sec. since the first sight. Later on, I see the train passing through a bridge of 180 ft in 12 secs. If the length of the truck is 168 ft, what is the speed of the truck in mph?

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Problems from 05/24/12

PROBLEM #1
What is the single digit sum of the digits of 9⁹?
(example: for 2¹¹ = 2048, sum = 2+0+4+8 = 14, sum = 1+4 = 5)

SOLUTION 1
9.

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?

SOLUTION 2
Starting counting from the white mouse, cat should start from 7th mouse.


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.