Let Trevon's average speed be S

Then Molly's is: S + 10

When Trevon arrived at the "catch-up point," he'd traveled 6 (2 + 4) hours

When Molly arrived at the "catch-up point," she'd traveled 4 hours

As they'd traveled the same distance when she caught up, we get the following DISTANCE equation: 6S = 4(S + 10)

6S = 4S + 40

6S - 4S = 40

2S = 40

S, or Trevon's average speed =  

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