This Brainteaser is slightly harder so try it.
One family wants to get through a tunnel. Dad can make it in 1 minute, mom in 2 minutes, son in 4 and daughter in 5 minutes. No more than 2 persons can go through the tunnel at one time, moving at the speed of the slower one. Can they all make it to the other side if they have a torch that lasts only 12 minutes and they are afraid of the dark?
Answer: No peeking to you have worked it out.
First mom and dad – 2 minutes. Dad comes back – 3 minutes, both children go to mom – 8 minutes. Mom comes to dad – 10 minutes and they both get to their children – 12 minutes.
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