Fred was on a cliff, while barney was on the rubble at the bottom of the cliff. they each tossed a chunk of flint straight up into the air at the same time. Fred's rock was released at 20meters above Barney's, and Barney caught both rocks 5.0 seconds after they were released at the same height from which he'd released his rock. If barney's rock was at the top of its arc 2.5 seconds after its release, how many seconds after its release was fred/s rock at the top of its arc?

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