how do you convert 2 centimetres per second into kilometres per day?
according to the answer key..the answer is 1.728
know your conversion factors
1 km = 1000 m = 100,000 cm
and 1 day = 24 hrs = 1440 mins = 86,400 sec
thus, $\displaystyle \frac {2~cm}{1~sec} \times \frac {1~km}{100,000~cm} \times \frac {86,400~sec}{1~day} = \frac {1.728~km}{1~day} = 1.728 \mbox{ km/day}$
do you need help setting up the above expression?