Aptitude - Problems on H.C.F and L.C.M - Discussion
Discussion Forum : Problems on H.C.F and L.C.M - General Questions (Q.No. 15)
15.
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?
Answer: Option
Explanation:
L.C.M. of 252, 308 and 198 = 2772.
So, A, B and C will again meet at the starting point in 2772 sec. i.e., 46 min. 12 sec.
Discussion:
66 comments Page 5 of 7.
Vinay said:
10 years ago
Please tell me how to find L.C.M in quick time for far numbers?
Teja said:
10 years ago
After seeing this question I first thought, this question might be from TRAIN AND DISTANCE.
How can one know that we have to LCM for such kind of questions?
How can one know that we have to LCM for such kind of questions?
Mahendra said:
10 years ago
How did you know that is to take LCM or HCF such types of questions?
Renuka said:
10 years ago
L.C.M means just remember that the highest number should be taken and common factor for the all given numbers. I hope yow will understand.
Madhavi said:
1 decade ago
Actually my problem is- taking out LCM will give when they'll meet i.e. it'll give the time at which they'll meet again but it's not necessary that they meet at the starting point? I guess dean's logic is correct.
Dean said:
1 decade ago
It can't be determined unless the whole length of the track is given. Anyway, they will meet on the track again after 46 m 12 s but not necessarily at the starting point.
Akshay said:
1 decade ago
Here every one should be at the same time according to question.
But after completion of 1 round not before it.
So each individual have to complete the round. That's why we have to consider their full time that's the reason to take LCM.
But after completion of 1 round not before it.
So each individual have to complete the round. That's why we have to consider their full time that's the reason to take LCM.
Senthil said:
1 decade ago
What is the need to take L.C.M in this question?
Ghanshyam said:
1 decade ago
And how to calculate HCF? Please tell me this answer also.
NaveenKK said:
1 decade ago
How we can get quick idea LCM as answer at exam time?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers