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Mademuasel [1]
3 years ago
11

Two light houses flash their lights every 30 seconds and 40 seconds respectively. given that they last flashed together at 10:40

Mathematics
2 answers:
Paul [167]3 years ago
8 0
If they flash at 30 and 40 seconds, then a diagram showing their timing helps

30, 60, 90, 120
40, 80, 120

So after 120 seconds, both lighthouses flash at the same time
120 sec = 2 minutes

So the answer is 10:42
Aleksandr-060686 [28]3 years ago
3 0
Find the common muliple 120seconds is 2mins herefors 10.42
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