Twin brothers, Kenny and Isaiah, live in Small Town, USA where it snows an
average of 55 days each winter. They take turns shoveling the walkway after each
snowfall. Kenny can shovel the walkway in 20 minutes, while it takes Isaiah only 15
minutes to shovel the same walkway. How many minutes will it take to shovel the
walkway if they work together? Express your answer as a decimal to the nearest
tenth.
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