Question 840836
If A car travels at 20 mph for 2 miles and 40 mph for 8 miles,
 what is the average rate of speed?
:
Write a time equation; time = dist/speed
let a = the average speed
{{{2/20}}} + {{{8/40}}} = {{{10/a}}}
multiply by 40a, cancel the denominators, and find a