In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.
Rahul nd Raghav are 110 km apart from each other and they started horse-riding towards each other at same time at a speed of 20 kmph and 24 kmph. After how many hours of riding will they be a distance of 22 km?