Question

Light travels at 3.0 × 108 m/s in a vacuum
(about the same in air) - how many km/h is
this?

Answer 1

We've got m/s, which is value of distance ÷ time

(distance/time)

3 x 10^8 is:

300,000,000m/s

1km = 1000m

1hr = 3600secs

So, divide 300,000,000m by 1000 to get in km & you get:

300,000km

Now divide this value by 3600 seconds to get it in km/hr

300,000km/3600 = 83.33333333

Thus, answer is 83.3km/h

Or

8.33 x 10^1 km/h (in standard form)

(doing 83.3 recurring multipled by 1000 & 3600 gets you back to original answer. So, 83.33333...x1000x3600= 300,000,000)

Hope this helps!