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Mathematics: extra points for solving the problem of taxi fare
Pay taxi fare when driving for 3 kilometers or less 10 yuan;

Take a taxi 10km, and pay the fare 10+( 10-3) × 2 = 24 yuan;

(1) 24+~15-10 ~× 3 = 39 (yuan)

(2) If the taxi mileage is 13. 1 km, the fare payable is 24+-14-10-× 3 = 38 > 31.

insufficient money

3 1 yuan money can sit at most10+-31-24÷ 3 ≈12 km away.

He must walk at least13.1-12 =1.1km = 1 100 meters.