Question
Wendy was travelling from Point P to Point Q at a constant speed of 70 km/h. After 3 hours, she passed a car coming from the opposite direction. Wendy travelled another 210 km to reach Point Q. At this point, the car was still 42 km from Point P. What is the average speed of the car?
3 m

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Wendy was travelling from Point P to Point Q at a constant speed of 70 km/h. After 3 hours, she passed a car coming from the opposite direction. Wendy travelled another 210 km to reach Point Q. At this point, the car was still 42 km from Point P. What is the average speed of the car?