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12-09-2014
Physics

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distance of 45 km with the modernist speed of 20 km per hour is

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12-09-2014

The question is not clear, but I'll take a crack at what I think you're asking:

Driving at 20 km/hour, it takes 45/20 = 2.25 hours to cover 45 km.

That's 2 hours and 15 minutes.

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