Skip to main content

Aptitude Day 297

Answers of Day 296: 1. 16 seconds. 
                                    2. 100 m.


Problems on Trains:

1. 2 trains are running in opposite directions at the same speed. If the length of each train is 150 m and they cross each other in 15 seconds, then the speed of each train is:

Solution:
                  2x = 150/15
                  x = 5 m/s

                 Speed = 5*18/5 
                            = 18 km/hr.

2. 2 trains of equal lengths 10 and 5 seconds respectively to cross a post. If the length of each train be 100m, in what time will they cross each other travelling in opposite direction?

Solution:
                  Speed of the train 1 = 100/10 = 10 m/s.
                  Speed of the train 2 = 100/5 = 20 m/s.

                 Time = (100+100)/(20+10) 
                          = 200/30 
                          = 6.7 seconds.



Comments

Post a Comment

Popular posts from this blog

Aptitude Day 47

Problem On Numbers 1. Three numbers are in the ratio 1:2:3 and their average is 180. What's the largest number? Solution:                 Let the numbers be x, 2x and 3x.                 x+2x+3x = 180                          6x = 180                            x = 30                The largest number is 3x = 90. Problem to solve: Three numbers are in the ratio of 4:2:3 and their product is 648. Find the smallest number. 
Post a Comment
Read more

Vocabulary Day 21

Stammer Thesaurus: Verb : stutter in speech, speak haltingly, speech defect           halt, hesitate, pause, stop, sputter... Antonyms : say quickly, pronounce, enunciate... Example sentences: ·          He was stammering when the teacher caught him red-handed. ·          One should avoid the stammering while delivering a speech. 
Post a Comment
Read more