Task: Question Answering
Input (English): Problem: the walker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at 20 miles per hour . the cyclist stops to wait for the hiker 5 minutes after passing her , while the walker continues to walk at her constant rate , how many minutes must the cyclist wait until the walker catches up ? 
Options: a ) 16 , b ) 18 , c ) 20 , d ) 22 , e ) 24
Output (English): c