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How would I solve this problem

How would I solve this problem-example-1
User Sureone
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After t hours, the first truck covers a distance of (70 km/h) t while the second truck covers a distance of (80 km/h) t. So the distance between them is

(70 km/h) t + (80 km/h) t = (150 km/h) t

They are 900 km apart after

(150 km/h) t = 900 km ===> t = (900 km) / (150 km/h) = 6 h

User Luca Gibelli
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