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 6 of 7.
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.
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.
Deepak said:
8 years ago
The Right answer is 46 minutes and 20 seconds, this is a correct solution which I am going to explain below:
Lcm of (252,308,198) is 2772 seconds.
Converting in minutes by dividing 60,
2772/60 = 46 minutes and 20 seconds.
Lcm of (252,308,198) is 2772 seconds.
Converting in minutes by dividing 60,
2772/60 = 46 minutes and 20 seconds.
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?
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