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 3 of 7.
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.
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.
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.
Mahendra said:
10 years ago
How did you know that is to take LCM or HCF such types of questions?
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?
Vinay said:
10 years ago
Please tell me how to find L.C.M in quick time for far numbers?
Syed Nadeem Asghar Rizvi said:
9 years ago
When I am doing 2772/60 (min) = 46.2 min is coming which means 46 mins. 2 secs.
Kinjal said:
9 years ago
@Teja.
For train and distance question this question has inadequate data as there is no speed or distance given, hence we have to take it as L.C.M question.
For train and distance question this question has inadequate data as there is no speed or distance given, hence we have to take it as L.C.M question.
Niha said:
9 years ago
Why we have to take LCM for this problem?
Umar said:
9 years ago
When to take LCM and HCF? Are there any keywords in the question?
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