Solution to puzzle 37

-

Let us assume that on that day, Amanda took t minutes to drive half way to her son's school and back home. And as she reached home 40 minutes early, it would have taken t+40 minutes usually.

Let us say Amanda meets her son returning from school at point P. So the travel from P to school and back to P would have caused extra 40 minutes normally.

As she is traveling in a constant speed, the one way journey from point P to Mat's school would take half the time - 20 minutes. 

Amanda would have reached school at 5 pm. Which means she reached point P at 5 pm - 20 minutes = 4:40 pm. So Amanda meets her son at 4:40 pm.

Now Mat has traveled one hour before meeting his mother - so he has started from school at 3:40 pm.  As chess club completes at 5 pm, he has missed 1 hour and 20 minutes of chess practice.

Comments

Post a Comment

Popular posts from this blog

Puzzle 9 : The 4 coins problem

-
 Solution to puzzle 8: Maria is not counting Sundays. So she is not counting 1/7th of days of her age.  That is to say she is only counting 6/7th of her age. 6/7th of her age = 30 Her actual age = 30 X 7/6 = 210/6 = 35 years.  Puzzle 9 : The 4 coins problem  You’re creating a new coin system for your country. You must use only four coin values and you must be able to create the values 1 through 10 using one coin at a minimum and two coins maximum. What 4 coins do you choose, and can you think of a second set of 4 coins that achieves the same goal?
Read more

Puzzle 66 - solution

-
 The question was  What is wrong with this proof ? a=b multiply both the sides by a     --1 a2 = ab  add -b2 to both the side           --2 a2-b2 =ab-b2  factorizing                                --3 (a+b)(a-b) = b(a-b)  divide both the sides by (a-b)    ---4 a+b=b Substituting a with b,              ---5 2b = b Dividing both the sides by b    ---6 2 = 1   The problem is with step 4. When a is equal to b, a-b is zero. You can not divide numbers by zero because division is only defined for non-zero numbers.  
Read more

Puzzle 35 - Open sesame

-
I am writing a post after two months.  Here is a locked question ;) There is a number lock. You have to find the number to unlock it.  And here are the results of various number combinations. 682 - one digit is right and in the right position. 614 - one digit is right but in the wrong position. 206 - two digits are right but both are in the wrong positions. 738 - all digits are wrong. 380 - one digit is right but in the wrong place So what is the correct code to open the lock? Find the solution here
Read more