Michael A. answered • 08/05/17

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If we let x = the amount of time it took David to walk to school from home, then

(x + 10) = the amount of time it took David to walk from school to home

The sum of these two must equal to 54, so we have:

x + (x + 10) = 54

2x + 10 = 54

2x = 44

x = 22 minutes = the amount of time it takes David to walk from home to school