Bridge Crossing 2, Math Puzzles

John and his family members want to cross to the other side of the bridge at night. They have only one lamp which lasts for only 30 minutes. A maximum of only two persons can cross at one time, and they must have the lamp with them. Each person walks at a different speed. John walks at a speed of 1 min, his brother jack walks at 3 min, his mother Julie walks at 6 min, his father Jeff walks at 8 min and his grandpa George walks at 12 min. A pair must walk together at the rate of the slower person. How can John's family cross the bridge?

Bridge Crossing 2 Puzzle

First John and his brother Jack cross the bridge, which takes 3 minutes.
After this, John walks back with lamp, it takes 1 minute. Then Johns gives the lamp to his father Jeff and grandpa George.
Jeff and George cross the bridge with 12 minutes.
Jack returns back with the lamp, which takes 3 minutes and handover the lamp to john.
John and his mother Julie crosses the bridge, it takes 6 minutes.
Now again john takes the lamp and cross the bridge with 1 minute.
Finally John and Jack cross the bridge with 3 minutes.
Total = 3 + 1 + 12 + 3 + 6 + 1 + 3 = 29 minutes
There is 1 minute left!

John and his family members want to cross to the other side of the bridge at night. They have only one lamp which lasts for only 30 minutes. A maximum of only two persons can cross at one time, and they must have the lamp with them. Each person walks at a different speed. John walks at a speed of 1 min, his brother jack walks at 3 min, his mother Julie walks at 6 min, his father Jeff walks at 8 min and his grandpa George walks at 12 min. A pair must walk together at the rate of the slower person. How can John's family cross the bridge?

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