Question: I'm having problems figuring out the appropriate formula an solving this problems. Darryl left the science museum and drove toward the capital.Two hours later Trevon

I'm having problems figuring out the appropriate formula an solving this problems.

Darryl left the science museum and drove toward the capital.Two hours later Trevon left the science museum driving 20 km/h faster in an effort to catch up to him.After three hours Trevon finally caught up.What was Darryl's average speed?

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