NavyCo
23.04.2021 •
Mathematics
3) 14, 9, 20, 5, 17, 13 mean:
median:
mode:
range:
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Ответ:
Let's say you are paddling at 5mph and the current is 3 mph. Going upstream, you are going 2 mph and downstream, 8 mph.
8(b - c) = 440
9(b + c) = 837
b - c = 55
b + c = 93
Adding the two together...
2b = 148
b = 74
74 - c = 55
c = 19
The boat's speed is 74 mph and the current's speed is 19 mph.