Question
Lilian and David started driving from the same house but in opposite directions along a straight road. After driving for 2 hours, they were 310 km apart. Lilian's average speed was 90 km/h. What was David's average speed?
2 m

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Lilian and David started driving from the same house but in opposite directions along a straight road. After driving for 2 hours, they were 310 km apart. Lilian's average speed was 90 km/h. What was David's average speed?