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Maths Puzzle
Numerical Ability
A canoeist paddled 4 hours with a 6=km/h current to reach a campsite. The return trip against the same current took 10 hours. Find the speed of the canoe in still water.
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book Other Question
It takes Tom 4 hours to buid a fence. If he hires Jack to help him, together they can do the job in just 3 hours. If Jack built the same fence alone, how long would it take him?
Divide.
(a^4 –1) / (a^2 –1)
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