Question: Could someone show me step by step how to solve a problem like this? A car has an average speed of 84.9 km/h for one

Could someone show me step by step how to solve a problem like this?

A car has an average speed of 84.9 km/h for one hour, then an average speed of 94.8 km/h for two hours during a three hour trip. What was the average speed for the three hour trip? V km/h

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