Question
Riordan and Michael started driving from the same house but in opposite directions along a straight road. After driving for 2 hours, they were 310 km apart. Riordan's average speed was 70 km/h. What was Michael's average speed?
2 m

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Riordan and Michael started driving from the same house but in opposite directions along a straight road. After driving for 2 hours, they were 310 km apart. Riordan's average speed was 70 km/h. What was Michael's average speed?