Task: Question Answering
Input (English): Problem: maxwell leaves his home and walks toward brad ' s house at the same time that brad leaves his home and runs toward maxwell ' s house. if the distance between their homes is 70 kilometers, maxwell ' s walking speed is 4 km / h, and brad ' s running speed is 6 km / h, what is the distance traveled by brad ?
Options: a. 42, b. 18, c. 20, d. 24, e. 30
Output (English): a