Janet lives in a city built on a grid system.  She walks 3 blocks north, then seven times as many blocks west. Then she turns around and walks 8 blocks south and twice as many blocks east in the direction of her home. If Janet can walk 2 blocks/minute, how long will it take her to get home?
First, find the total number of blocks south Janet is from her starting point by subtracting the blocks she walked north from the blocks she walked south: 8 blocks - 3 blocks = <<8-3=5>>5 blocks
Then find the number blocks she walked west: 3 blocks * 7 = <<3*7=21>>21 blocks
Then find the number of blocks she walked east: 8 blocks * 2 = <<8*2=16>>16 blocks
Subtract the number of blocks she walked east from the number of blocks she walked west to find how many blocks west of her starting point she is: 21 blocks - 16 blocks = <<21-16=5>>5 blocks
Add the number of blocks she needs to walk north to the number of blocks she needs to walk east: 5 blocks + 5 blocks = <<5+5=10>>10 blocks
Finally, divide the distance she needs to walk by her speed to find how long she'll spend walking: 10 blocks / 2 blocks/minute = <<10/2=5>>5 minutes
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