A $25 \mathrm{cm}$ long string is fixed at both ends. It has a mass of $2.5 \mathrm{g}$ and vibrates in its first overtone under tension. Also given is a closed pipe which is  $30 \mathrm{cm}$ long which vibrates in its fundamental frequency. When both of these are sounded simultaneously, $8$ beats per second are heard. It is also observed that decreasing the tension in the string also decreases the beat frequency. What is the tension (in $\mathrm{N}$) in the string? [Given, speed of sound in air is $360 {\mathrm{ms}}^{-1}$]

Hence, the correct answer is 59.29.