67
Four bells ring at the intervals of 5, 6, 8 and 9 seconds . All the bells ring simultaneously at some time. They will again ring simultaneously after
- A6 minutes
- B12 minutes
- C18 minutes
- D24 minutes
Answer not set
Log in or create a free account to reply and vote.
0
CCommunity
6 minutes is the correct answer as per the ssc answer key
0
CCommunity
1 hour and 45 minutes
= 105 minutes
1 hour = 60 minutes
LCM of 30 minutes, 60 minutes,
90 minutes and 105 minutes
LCM = 3 × 5 × 2 × 2 × 3 × 7
= 1260 minutes
1260 minutes = $\frac{1260}{60}$ = 21 hours
The bell will again ring simultaneously
after 21 hours.
\ Time will be
= 12 noon + 21 hours
= 9 a.m.
= 105 minutes
1 hour = 60 minutes
LCM of 30 minutes, 60 minutes,
90 minutes and 105 minutes
LCM = 3 × 5 × 2 × 2 × 3 × 7
= 1260 minutes
1260 minutes = $\frac{1260}{60}$ = 21 hours
The bell will again ring simultaneously
after 21 hours.
\ Time will be
= 12 noon + 21 hours
= 9 a.m.
0
CCommunity
6 min