Task: Question Answering
Input (English): Problem: excluding the stoppages , the speed of a bus is 64 km / hr and including the stoppages the speed o the bus is 48 km / hr . for how many minutes does the bus stop per hour ? 
Options: a ) 22 , b ) 15 , c ) 77 , d ) 28 , e ) 91
Output (English): b