**Concept:** The question tests on the basics of Speed(Rates)

**Solution:**

Let the original speed = s. Therefore the new speed = 1.2 s

Let the original time = t. Therefore the new time = t - 20

Since distance is a constant, s1 * t1 = s2 * t2

s * t = 1.2s *(t - 20)

t = 1.2t - 24

0.2t = 24

t = 240 / 2 = 120 minutes = 2 hours**Option c**