steve traveled the first 5 hours of his journey at 40 mph and the last 3 hours of his journey at 80 mph . what is his average speed of travel for the entire journey ?
average speed = total distance / total time = ( 40 * 5 + 80 * 3 ) / ( 5 + 3 ) = 440 / 5 = 88 answer : b
add(divide(add(multiply(80, 3), multiply(40, 5)), add(3, 5)), subtract(divide(const_100, const_3), const_0_33))