Task: Question Answering
Input (English): Problem: a man covers a certain distance on bike . had he moved 4 kmph faster , he would have taken 72 minutes less . if he moves slow by 4 kmph , he will take hours more to cover the distance . what is the distance travelled by him ? 
Options: a ) 48 km , b ) 56 km , c ) 64 km , d ) 96 km , e ) 106 km
Output (English): d