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on which day a hot day or a cold day an echo is heard sooner? give reason for your answer

on a hot day because on a hot day the speed of sound increases 

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The speed of the sound increases on a hotter day and it requires a larger distance from the reflecting surface for the echo to be heard since the distance between the reflecting surface and the source of the sound remains the same no echo can be heard on a hotter day
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Hot day because the speed increseas on an hot day
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Hot day because at high temprature the sound travels fast
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It will take same time as for hearing echo the minimum time difference should be 1/10 th of second
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