Definition: In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: tim and e lan are 30 miles away from one another . they are starting to move towards each other simultaneously , tim at a speed of 10 mph and e lan at a speed of 5 mph . if every hour they double their speeds , what is the distance that tim will pass until he meets e lan ?
Options: a ) 20 miles . , b ) 35 miles . , c ) 45 miles . , d ) 60 miles . , e ) 65 miles .
Output:
a