Task: Question Answering
Input (English): Problem: natasha climbs up a hill , and descends along the same way she went up . it takes her 4 hours to reach the top and 2 hours to come back down . if her average speed along the whole journey is 1.5 kilometers per hour , what was her average speed ( in kilometers per hour ) while climbing to the top ? 
Options: a ) 1.065 , b ) 1.125 , c ) 1.225 , d ) 1.375 , e ) 1.425
Output (English): b