Atrain travels at a rate of 30 mph and distance of 240 miles how long did it take the train to complete its journey

It took the train 8 hours to complete its journey.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.