Please help with this one, too. Thanks.?

The SR-71 "Blackbird" is one of the world's fastest airplanes. It is capable of traveling at a cruising speed of Mach 3, or three times the speed of sound. The speed of sound is approximately 7.6 x 10^2 miler per hour. What is Mach 3 in miles per hour? This answer needs to be in scientific notation.