The light speed is 3.0 xx 10^(8) m//s, a...

The light speed is `3.0 xx 10^(8) m//s`, and the sound speed is 340 m/s. Find the value of count N, if ''A child start counting after every second, he sees a bomb blast 1km away and stops when he hear its 'blast sound."

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The light speed is `3.0 xx 10^(8) m//s`, and the sound speed is 340 m/s. Find the value of count N, if ''A child start counting after every second, he sees a bomb blast 1km away and stops when he hear its 'blast sound."

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