Question

Rashmi sets alarm in two different clocks. The first alarm rings after every 30 minutes and the second rings after every 90 minutes. If they ring together at 11pm. They will ring again together at

Answer 1

Answer:

at 11a.m again I think in morning

Answer 2

Answer:

30 and 90's lcm=90

if they ring together at 11pm

they will ring again=11+1½(90 minutes=1½ hour

=12½

so, the clocks ring again together at 12:30a.m