OCTOBER CHALLENGE Filling the Pool
A swimming pool has four faucets . The first can fill the entire pool with water in two days , the second - in three days , the third - in four days , and the last one can fill the pool in 6 hours .
How long will it take to fill the pool using all 4 faucets together ?
Please send you answers to Thomas Selling via e-mail : thomasselling @ me . com Correct responses will be recognized in the future issues of the New Hampshire Civil Engineer .
AUGUST / SEPTEMBER SOLUTION
Since the laptops are all otherwise identical , all that matters is determining which laptops need to go to the U . S . Adding ports to a laptop increases the weight , so the U . S . laptops will be slightly heavier . Mark should take one laptop each from pallets 1-5 , and balance that group against laptops taken from pallets 6-10 . After determining which group is heavier , he should balance two laptops from that group against two other laptops from that group . If one of those pairs is heavier , he should balance those two laptops against each other to determine which is the one destined for the U . S . If both of those pairs weigh the same , then he knows the remaining laptop is from the pallet meant for the U . S .
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