we have
x(hrs) y(mi)
for 1 hour -- 52 miles
for 2 hours -- 2*52=104 miles
for 3 hours -- 3*52=156 miles
for 5 hours -- 5*52=260 miles
for 7 hours -- 7*52=364 miles
for 8 hours -- 8*52=416 miles
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