Rahul and Raghav are 110 km apart from each other and they started horse-riding towards each other at the same time at a speed of 20 km/hr and 24 km/hr. After how many hours of riding will they be a distance of 22 km?

A. 1 hour

B. 1 hour 30 min

C. 2 hour

D. 2 hours 30 min