Q144
An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 am. The next time, when they would beep together at the earliest is = ?
A.
10.30 am
B.
10.31 am
AnswerC.
10.59 am
D.
11 am
Answer: Option B
Solution
Answer: Option B
Solution:
Interval of change= (LCM of 60 and 62) sec
= 1860 sec
= 31 min
So, the devices would beep together 31 min after 10 am
i,e; at 10.31 am