Two runners \( \mathrm{A} \) and \( \mathrm{B} \) are running on a circu- (W) lar track. A takes...

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Two runners \( \mathrm{A} \) and \( \mathrm{B} \) are running on a circu-
(W) lar track. A takes 40 seconds to complete every round and \( \mathrm{B} \) takes 30 seconds to complete every round. If they start simultaneously at 9:00 am, then which of the following is the time at which they can meet at the starting point?
(a) 9:05 am
(b) 9:10 am
(c) 9:15 am
(d) 9:13 am
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