Question
Riordan and Mason started driving from the same flat but in opposite directions along a straight road. After driving for 3 hours, they were 420 km apart. Riordan's average speed was 70 km/h. What was Mason's average speed?
2 m

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Riordan and Mason started driving from the same flat but in opposite directions along a straight road. After driving for 3 hours, they were 420 km apart. Riordan's average speed was 70 km/h. What was Mason's average speed?