Respuesta :

28 miles

increasing by 40% = original + increase = 100 + 40 = 140% = 1.4

multiplying 20 by 1.4 gives total he will run

miles run = 1.4 × 20 = 28


altavistard

Answer:

28 miles

Step-by-step explanation:

Just multiply (20 miles per week) by 1.40:    1.40(20 mpw) = 28 miles