Question

 A space ship sends a radio transmission back to earth, which is  2.75 x 109 m away. How long will this transmission take? 

Answer 1

As you know,

$time = \frac{distance}{speed}$

Now, Distance is given as: 2.75 x 10⁹ m

Speed of radio waves: 3 x 10⁸ m/s

So, time = (2.75 x 10⁹) / (3 x 10⁸)

= 9.16 seconds