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# The speed of light in a vacuum is ##2.998 xx 10^8 "m/s"##. (a) What is its speed in kilometers per hour (km/h)? (b) What is its speed in miles per minute (mi/min)?

For part **(a)**: ##c = 1.079 * 10^(9)"km/h"##
For part **(b)**: ##c = 1.118 * 10^7"mi/min"##

To solve this problem you need to be familiar with several conversion factors. More specifically, you need to know that

##"1 km" = 10""^3"m"##

##"1 h" = "60 min" " "##and ##" ""1 min" = "60 s"##

##"1 mile" = "1.609344 km"##

SO, for part **(a)**, you need to go from meters to kilometers and from seconds to minutes, then to hours.

##2.998 * 10^(8)color(red)(cancel(color(black)("m")))/color(red)(cancel(color(black)("s"))) * "1 km"/(10^3color(red)(cancel(color(black)("m")))) * (60color(red)(cancel(color(black)("s"))))/(1color(red)(cancel(color(black)("min")))) * (60color(red)(cancel(color(black)("min"))))/(1color(red)(cancel(color(black)("h")))) = 10792.8 * 10^(5)"km/h"##

Rounded to four , the number of sig figs you gave for the speed of light in meters per second, the naswer will be

##c = color(green)(1.079 * 10^(9)"km/h")##

Now for part **(b)**. Now you need to go from meters to kilometers, then to miles, and from seconds to minutes.

##2.998 * 10^(8)color(red)(cancel(color(black)("m")))/color(red)(cancel(color(black)("s"))) * (1color(red)(cancel(color(black)("km"))))/(10^3color(red)(cancel(color(black)("m")))) * "1 mile"/(1.609344color(red)(cancel(color(black)("km")))) * (60color(red)(cancel(color(black)("s"))))/"1 min" = 111.77 * 10^(5)"mi/min"##

Once again, round the answer to four sig figs

##c = color(green)(1.118 * 10^7"mi/min")##