Question 1086473
1)Lisa drove 60 miles, then increased her speed by 15 miles per hour for 135 miles. If the second part of the drive took 1 hour longer than the first part, find her average speed.
 What I have so far:    240/(s-20)    -60/s the whole eq multiplied by s(s-20)
<pre>1st, I think the numbers you have, so far, have nothing to do with this problem. I think the numbers you have, so far, have to do with: Travel_Word_Problems/1086474: 
The answer to this problem (# 1086473): {{{highlight_green(matrix(1,6, The, average, speed, is, 39, mph))}}}
IGNORE anyone who says otherwise!