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06.11.2019 •
Mathematics
Joan is an experienced jigsaw puzzler. on average, she will correctly place a puzzle piece every 30 seconds. a) how long, in hours should it take joan to finish a 3000 piece puzzle? b) how long, in hours and minutes, should it take joan a 10,000 piece puzzle? c) joan works on a puzzle from 7: 00 p.m. to 9: 00 p.m. every weekday. ( she does not work on her puzzle on saturday or sunday.) if she started a new 10,000 piece puzzle on january 15, 2020, on which date would she finish?
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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.