How many inches are there in one kilometer? Please show the use of dimensional analysis

Question

 need help and show steps please

Answer 1

 

             1 mile            5280 ft          12 in

1 km  *  -----------  * ----------- *  --------------   = 39600 in

             1.6 km          1 mile           1 ft

 

5280*12/1.6 = 39600