Matthew gets picked up from school every day by his father. One day, though, Matthew leaves school 50 minutes earlier than usual. Since he doesn't want to stay waiting so long, he decides he can just start walking and meet his father on the way. His father picks him up from the road and they arrive home 4 minutes earlier than they usually do on any other day. How much time did Matthew spend walking until his father picked him up?


The way from school ***

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