If he walks for 7 hours, how far will he have gone?

But how far in eight hours could a fit, trained person walk? In about seven hours, many trained walkers finish a 26.2-mile walker-friendly marathon, with no breaks. If a walker is well-trained and takes breaks and stops for a meal, it is reasonable to do 20 miles a day.

Could you make it more clear?

32.10 is the correct answer