If the teachers beard grows at .003 meters/week how fast does it grow in km/second

Question

                                                      Please answer this because I feel that I'm answering it wrong 

Answer 1

0.003 m / week                                      change meters to centimeters (1 m = 0.001 km)

0.000003 km / week                              change weeks to seconds (1 week = 604800 sec)

0.000003 km / 604800 sec                    divide

0.00000000000496031746 km / sec     or in scientific notation

4.96031746 x 10^-12 km / sec