A trains cover 180 km, distance in 4 hours another train covers the same distance in 1 hour less. What is the difference in the distances covered by these trains in one hour?

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A trains cover 180 km, distance in 4 hours another train covers the same distance in 1 hour less. What is the difference in the distances covered by these trains in one hour?

45 km

9 km

40 km

10 km

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