请教一五年级数学题。A rowing team was practicing on the river. The took 6 minutes to cove 1 km with the current flowing to push them. If there had been no current they would have taken 8 minutes.How many kilometres an hour was the current flowing?
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人速=1/8 km/minute
水速+人速= 1/6km/minute
水速=1/6-1/8 km/minute=(1/6-1/8)*60 km/hour
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厉害
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厉害
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小心，有人在灌水，所以有水的速度。
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(8-6)= 2mins per Km, so speed is 30km/hour
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船在有水流辅助的情况下的速度: 10km/hour
(6 min - 1km means 1/6 km/min means 10km/hour)
船在没有水流辅助的情况下的速度: 7.5km/hour
(8 min - 1km means 1/8 km/min means 7.5km/hour)
水流速度: 10km/hour - 7.5km/hour = 2.5km/hour
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船在有水流辅助的情况下的速度: 10km/hour
(6 min - 1km means 1/6 km/min means 10km/hour)
船在没有水流辅助的情况下的速度: 7.5km/hour
(8 min - 1km means 1/8 km/min means 7.5km/hour)
水流速度: 10km/hour - 7.5km/hour = 2.5km/hour
评论
谢谢各位，老师给的答案是2.5。看了峨眉高手的回复才搞清楚。
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