Respuesta :
Answer is 7:21am,
12x3=36
9x4=36
Hence 6:45am adding 36 mins equals to 7:21am
12x3=36
9x4=36
Hence 6:45am adding 36 mins equals to 7:21am
After 36 min , first alarm will ring 4 times (36=4*9) and the second alarm 3 times (36=3*12)
6.45- 6.54- 7.03- 7.12- 7.21
6.45- 6.57- 7.09- 7.21
At 7.21 will ring together
6.45- 6.54- 7.03- 7.12- 7.21
6.45- 6.57- 7.09- 7.21
At 7.21 will ring together