Skip to main content

Aptitude Day 283

Problems on Trains 

Formulae:

  • Time taken by a train of length ‘l’ meters to pass a pole or standing man = Time taken by the train to cover that same ’l‘ meters.
  • Time taken by a train of length ‘l’ meters to pass a stationary object of length ‘a’ meters is the time taken by the train to cover ‘(l+ a)’ meters.
  • If 2 trains are moving in the same direction, their relative speed should be their sum and the time taken by the 2 trains to cross each other = Sum of their lengths/ Relative speed.
  • If they run in the opposite direction, their relative speed will be their difference and the time taken by the 2 trains to cross each other = Sum of their lengths/ Relative speed.
  • If 2 trains start at the same time from points A and B towards each other and after crossing they take a and b seconds in reaching B and A respectively, then 
                                          (A’s speed): (B’s speed) = (b)1/2 : (a)1/2   

Comments

Post a Comment

Popular posts from this blog

Aptitude Day 5

Answers of Day 4 :   1. 9                                   2. 5                                   3. 9                                   4. 8 To find the unit digit in the product. This is similar to the last model where we will find the unit digit of the sum. Example: 432*459*28*48=? Solution:  2*9=18 , 8*8=64, 4*8= 32. The unit digit of the total product is 2.  Problems to solve Find the unit digit of the product in the following 1. 404*397*810*21 =? 2. 24*42*36*78 =? 3. 81*82*89 =? 4. 72*36*98*47 =? See you tomorrow friends... Check out the answers over here  Aptitude Day 6
Post a Comment
Read more

Aptitude Day 59

Answers of Day 58:     1. 1/90.     2. 20 Problems to solve: 1. The product of two numbers is 33 and the sum of their squares is 130. Find their difference. 2. The sum of two numbers is 100 and their difference is 20. Find their product.
Post a Comment
Read more

Vocabulary Day 7

Churn Thesaurus: Verb : mix up, beat            stir up, foam, simmer, agitate Noun: a device or a container which is used for making butter Example sentences:   My stomach is churning due to my upcoming performance.   She churns the butter. For more check out this  Vocabulary Day 8                                                                  
Post a Comment
Read more