# GATE2017-13

In a heat exchanger, the inner diameter of a tube is $25\:mm$ and its outer diameter is $30\:mm$. The overall heat transfer coefficient based on the inner area is $360\:W/m^{2}.^{\circ}C$. Then, the overall heat transfer coefficient based on the outer area, rounded to the nearest integer, is _______________ $W/m^{2}.^{\circ}C$.