Task: Question Answering
Input (English): Problem: anusha , banu and esha run a running race of 100 meters . anusha is the fastest followed by banu and then esha . anusha , banu and esha maintain constant speeds during the entire race . when anusha reached the goal post , banu was 10 m behind . when banu reached the goal post esha was 10 m behind . how far was behind anusha when the latter reached the goal post . 
Options: a ) 22 , b ) 88 , c ) 81 , d ) 66 , e ) 22
Output (English): c