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

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