Answer:
at 7:50 because after 10 min it will be 7:40 after more 10 min both clock's will ring as it is 7:50
explenation:
10 min from 7:30= 7:40. after more 10 min 7:40=7:50
20 min from 7:30 =7:50
thats my understanding
they will ring together at 7:50 am
Explanation:
then again at 8:10,8:30,8:50 ect
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