Question
At 9.50 a.m., a car left Town W for Town X at an average speed of 79 km/h, while a truck left Town X for Town W at an average speed of 78 km/h. At 2.50 p.m., the two vehicles were 21 km apart. How far apart were the two towns?
3 m

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At 9.50 a.m., a car left Town W for Town X at an average speed of 79 km/h, while a truck left Town X for Town W at an average speed of 78 km/h. At 2.50 p.m., the two vehicles were 21 km apart. How far apart were the two towns?