Task: Question Answering
Input (English): Problem: ana climbs up stairs 20 floors building and back . she takes the exact same route both ways . on the trip up she climbs an average speed of 2 steps per second . on the trip back she climbs down at an average speed of 4 steps per second . what is her approximate average speed for the round trip in miles per hour ? 
Options: a ) 1 , b ) 1.25 , c ) 1.33 , d ) 1.5 , e ) 1.75
Output (English): c