Are you intelligent enough to answer these? Part 3

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Hi guys, this is the part 3. Let's test your IQ. I'll wait for your answers. 11. Peter's youth lasted 1/6 of his life. He had the first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, Peter got married. Five years from then, his son was born. His son lived exactly 1/2 of his life. Peter died 4 years after the death of his son. How long did Peter lived? 12. The perimeter of the globe is approximately 40,000 km. If we use a circle of wise around the globe that is only 10 meters (0.01km) longer than the perimeter of earth, could a man, rabbit, or even a flea creep under it? 13. There is only one airport on a fictional planet and that is on the North pole. There are only 3 airplanes and lots of fuels at the airport. A full tank of an airplane lasts enough to fly to the pole, however the airplane can transfer their fuels among one another. Your mission is to fly around the globe with at least one airplane must be ok back at the airport. 14. A military car carrying an important letter must cross a desert. There are no petrol station on the desert and the car has space only for petrol that lasts up to the middle of the dessert. There are also other cars that can transfer their petrol into other cars. How can the letter be delivered? 15. One reservoir has four taps. Using the first tap, it takes two days to fill the reservoir, the 2nd tap three days, the 3rd tap four days and the last one 6 hours. What time will it last to fill the reservoir using all 4 taps at the same time?