time taken by stone to reach in water t1 = \sqrt{2h/g} = \sqrt{2*300/9.8} = 7.82 stime taken by splash to reach at top of towert2= h/v = 300/340 = 0.88 sSo total time = t1 + t2 = 8.7 sHope it clears. If you like anser then please approve it.
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