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Question

In the firing range, four shooters are firing at their respective targets. The first, the second, the third, and the fourth shooter hit the target once every 5 s, 6 s, 7 s, and 8 s, respectively. If all of them hit their target at 10:00 am, when will they hit their target together again?

A
10 : 14 am
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B
10 : 28 am
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C
10 : 30 am
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D
10 : 31 am
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Solution

The correct option is A 10 : 14 am
This question is about the LCM of 5s, 6s, 7s, and 8s, Then, LCM of 5s, 6s, 7s, and 8s = 840 sec = 14 min
Hence, the time obtained when they hit target together is = 10:14 am

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