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Physics 7 Online
OpenStudy (doc.brown):

A worker loads half a cubic meter of gravel into a wheelbarrow, travels for 4 minutes at 1m/s along a trail, and empties the wheelbarrow to cover the trail. It takes him one minute to spread the gravel 1.4m across the trail at a thickness of 0.1m. He then returns to the beginning of the trail at the same speed. How long does it take him to cover the entire trail?

OpenStudy (doc.brown):

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