<PRE><B>Question 1068972</B>
When? = time = x
Mandy: 20x
Liz: 30(x-1)
20x = 30(x-1)
20x = 30x-30 add 30 and subtract 20x on both sides:
10x = 30
x = 3 they will meet 3 hours after Mandy left, 2 hours after Liz left
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Check:
20(3) = 60
30(3-1) = 60 Correct
P.S.: this is another answer, in case you need it: they meet when each has traveled 60 miles
:
John</PRE>