Task: Question Answering
Input (English): Problem: alice and bob drive at constant speeds toward each other on a highway . alice drives at a constant speed of 30 km per hour . at a certain time they pass by each other , and then keep driving away from each other , maintaining their constant speeds . if alice is 100 km away from bob at 7 am , and also 100 km away from bob at 11 am , then how fast is bob driving ( in kilometers per hour ) ? 
Options: a ) 20 , b ) 24 , c ) 28 , d ) 32 , e ) 36
Output (English): a