Question
At 1.51 p.m., a car left Town Q for Town R at an average speed of 77 km/h, while a truck left Town R for Town Q at an average speed of 66 km/h. At 7.51 p.m., the two vehicles were 21 km apart. How far apart were the two towns?
3 m

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At 1.51 p.m., a car left Town Q for Town R at an average speed of 77 km/h, while a truck left Town R for Town Q at an average speed of 66 km/h. At 7.51 p.m., the two vehicles were 21 km apart. How far apart were the two towns?