Question
At 12 p.m., a car left City M for City N at an average speed of 100 km/h while a lorry left City N for City M at an average speed of 80 km/h. At 4.30 p.m., the two vehicles were 20 km apart. Find the distance between City M and City N.
3 m

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At 12 p.m., a car left City M for City N at an average speed of 100 km/h while a lorry left City N for City M at an average speed of 80 km/h. At 4.30 p.m., the two vehicles were 20 km apart. Find the distance between City M and City N.