Task: Question Answering
Input (English): Problem: richard walks along sunrise boulevard daily . he starts walking at 07 : 00 from block 10 and walks to block 90 where he turns around and walks back to block 70 , where he stops at 07 : 30 . the blocks along the boulevard are numbered sequentially ( 1 , 2,3 ) , and each block measures 40 meters . what is richard ' s speed in meters per minute ? 
Options: a ) 75 , b ) 180 , c ) 198 , d ) 216 , e ) 252
Output (English): a