1__ Puzzles of intelligence problems

2009-07-05

Question: Now xiaoming a bridge, the bridge is the night, so must have a lamp. Now Xiaoming Bridge to 1 seconds, Xiaoming's brother to 3 seconds, Xiaoming's father to 6 seconds, Xiaoming's mother to 8 seconds, Xiaoming's grandfather to 12 seconds. Each time the bridge can be up to two people, and the speed of the bridge depends on the slowest person on the bridge, and the lights will be extinguished 30 seconds after light. Ask Xiao Ming family How to cross the bridge.

Answer: First let xiaoming with his brother Bridge, and then xiaoming back, need------------3+1 = 4 seconds;

Then let Xiaoming and Father Bridge, xiaoming back, need---------------------6+1 = 7 seconds;

Then mom and grandpa across the river, brother back, need to------------------------12+3 = 15 seconds;

Then the younger brother and Xiaoming cross the river, need------------------------------------3 seconds;

Total 29 seconds