If the speed of light is 3 * 10⁵ km/s and 1 km = 0.62 miles, what is the speed of light in miles/hr? A) 670 million miles/hr B) 670 thousand miles/hr C) 186 miles/hr D) 186 thousand miles/hr E) 3.2 billion miles/hr

Question

Quizplus · Accepted Answer

First, we need to convert km/s to miles/hr. 
1 km = 0.62 miles 
1 s = 3600 seconds (1 hour) 
Therefore, 
Speed of light in miles/hr = (3 x 10^5 km/s) x (0.62 miles/km) x (3600 s/hr) 
= 671 million miles/hr (rounded to nearest million) 
So the best choice is A.

If the Speed of Light Is 3 * 105 Km/s

If the Speed of Light Is 3 * 10⁵ Km/s