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A scraper is to haul earth from a pit to fill 0.4 km away. If it is working under averagefixed-time conditions of 2.2 minutes, with an average haul speed of 7 kmph , with operating factor of 0.8, the number of cycles which can effectively be performed per hour is nearly:
1
5.4
2
6.4
3
8.5
4
9.6
5
10.8