A man is running at a speed of 60 km/h . if he runs at a speed of 40 km/h , then what will the decrease in the percentage of his speed be ?

25% 33\(\frac{1}{3}\)% 66\(\frac{2}{3}\)% 37%

33\(\frac{1}{3}\)%

Decreased value = Original value - New value = 60 - 40 = 20 km/hr Decreased Percentage = \(\frac{Decreased \; value}{Original\; value}\)                                    = \(\frac{20}{60}\) × 100 = 33 \(\frac{1}{3}\) %