Question 264022
How many seconds in an hour?
{{{60}}}sec = {{{1}}}min
{{{60}}}min = {{{1}}}hr
{{{60/1}}}sec/min x {{{60/1}}}min/hr = {{{3600}}}sec/hr
Notice that the min units cancel out because
(sec/min) x (min/hr) is the same thing as (min/min) x (sec/hr)
How many sec are there in an 8 hr day?
{{{3600}}}sec/hr x {{{8}}} hr/day = 28800 sec/day
Notice that (sec/hr) x (hr/day) = (hr/hr) x (sec/day), and
(hr/hr) x (sec/day) = sec/day
-------------------------------
How many km in {{{9}}}m?
{{{9}}}m x {{{1/1000}}}km/m = {{{9/1000}}} km
The cyclist travels {{{.009}}} km/sec
{{{d = r*t}}}
{{{d = .009*28800}}} (km/sec) x (sec/day)
{{{d = 259.2}}}km/day
The cyclist travels 259.2 km in an 8 hr day