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Find the number of times the heart of a human being beats in 10 years. Assume that the heart beats once in 0.8 sec.

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In 0.8 s, the human heart make on beat.

∴ In 1 s the human heart makes

\(\frac{1}{0.8}=\frac{10}{8}\) beats.

∴ In 10 years the human heart makes

\(\frac{10}{8}\times10\times365\times24\times60\times60\) beats

= 3.942 x 108 beats.

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