Can anyone give me a 4-5 sentence definition on spindle fibers?

Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.

As we know, time = Distance / Speed
here, distance = 5.88 * 10⁸ Km
speed of space shuttle = x

Time = 5.88 * 10⁸ Km / x

Here, when you'll put speed of space shuttle, you'll get your answer!

Hope this helps!