5. A secret message has been intercepted. It says, "Meet me in 35N45E 60N10E 57N10E 35N55E 30S60W." These coordinates fall in five different countries. The first letters of the countries spell a word. What word is it?

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.