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.
Vijay said:
8 years ago
2772/60 = 46 min and remaining 12 sec.
or
2772/60=>693/15=>231/5 = 46 min 1/5.
1/5 =1 * 60/5 = 12 sec.
46 min 12 sec.
or
2772/60=>693/15=>231/5 = 46 min 1/5.
1/5 =1 * 60/5 = 12 sec.
46 min 12 sec.
Rekha said:
1 decade ago
@Rehana.
Could you please explain when you took LCM of 63 77 99 with 7, how did it come out to be 9 11 9 (third step).
Could you please explain when you took LCM of 63 77 99 with 7, how did it come out to be 9 11 9 (third step).
Nagul said:
7 years ago
@All.
Simple solution:
The L C M of given number = 2772
=> 2772 ÷ 60 we get 46 as quotient and 12 as a reminder.
Simple solution:
The L C M of given number = 2772
=> 2772 ÷ 60 we get 46 as quotient and 12 as a reminder.
Akshay said:
1 decade ago
I am quite weak in determing the LCM. How did you arrive to a conclusion of 2772 ? could you show me the workings?
Hassan Raza said:
3 years ago
2772/60 = quotient = 46 ---> Minutes.
Remainder= 12----> second,
Thus, 46 minutes 12 second.
Remainder= 12----> second,
Thus, 46 minutes 12 second.
(10)
Shweta said:
9 years ago
@Liana.
To convert into minute = 2772/60 = 46 min and remainder is 12.
That's why 46 min 12 sec.
To convert into minute = 2772/60 = 46 min and remainder is 12.
That's why 46 min 12 sec.
(1)
Atul Khanna. said:
1 decade ago
Anyone can you explain what is the total number of revolutions of each of them in above question?
Rehana said:
1 decade ago
2/ 252 308 198=126 154 99
2/ 126 154 99= 63 77 99
7/ 63 77 99
11/ 9 11 9
9/ 9 1 9 = 1 1 1
2/ 126 154 99= 63 77 99
7/ 63 77 99
11/ 9 11 9
9/ 9 1 9 = 1 1 1
Rahul said:
1 decade ago
How the lcm 2772 came ? when I calculated it is big enough than 2772. Please explain me.
Sams said:
7 years ago
Can you kindly explain in details because I don't understand? Please help me to get it.
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