Task: Question Answering
Input (English): Problem: y and z walk around a circular track . they start at 5 a . m from the same point in the opposite directions . y and z walk at a speed of 3 rounds per hour and 4 rounds per hour respectively . how many times shall they cross each other before 7 a . m 
Options: a ) 14 , b ) 15 , c ) 16 , d ) 17 , e ) 18
Output (English): e