Question

three balls a, b, c that rings after every 4 minutes 6 minutes 3 minutes respectively ring together at 1:00 p.m. how many times will there in simultaneously between 1:00 p.m. to 2:00 p.m.?​

Answer 1

Considering the bell , it rings in 3mins ,6 mins and 4 mins .so lcm of 3,6 and 4 = 12 .so we cqn say that after every 12 mins they will ring together .

Time btw 2pm and 1pm = 60mins

so no of times bell rings together= 60min/12 min=5

so,5 times is the answer

Answer 2

No. of times does the bells ring simultaneously between 1:0pm to2:0pm= 60 minutes /LCM of 4,6 and 3

= 60 minutes/12 min

=5 times