Question

10. Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 minutes
respectively. After what interval of time will they toll together again?
11. An electronic device makes a beep after every 15 minutes. Another device makes a beep,
after every 20 minutes. They beeped together at 10 a.m. At what time will they make
the next beep together?​ With solution

Answer 1

(10).

Time will they toll together again :- (2+4+6+8+10+12)min

=42 min..

(11).

An electronic device make a beep after every 15min..

Time taken by the another device = 20min..

Once time they beep together at= 10:00 a.m

So, time will make by the both beep together :- 11:00a.m

Because 1hrs=60min

And first device beep after 15min

If it beep 4 times so the taken = 15*4 = 60min..

And second device beef after 20 mins

If it beef 3 times so the time taken=20*3= 60min..

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