The speed of light in a vacuum is 2.998 x 10⁸ m/s. Calculate its speed in km/hr.

1.07928 x 10⁹ km

Explanation:

How many seconds are there in an hour?

60 * 60 = 3600

If it takes light one second to travel 2.998 x 10⁸ m, then much distance would teh light cover in 3600 seconds?

2.998 x 10⁸ m * 3600 = 1.07928 x 1012 m

1000 m = 1 km

Therefore; 1.07928 x 10¹² m / 1000 m

= 1.07928 x 10⁹ km