(a) Time = {Distance \over Speed}
or t = {2d \over v}
or d = {vร๐ก \over 2} = {vร1 \over 2ร10} (โต Time = 0.1 s) = {๐ฃ \over 2d}
(b) The speed of sound increases with temperature. So, on a hotter day speed of sound is more.
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