Task: Question Answering
Input (English): Problem: train a leaves the station traveling at 30 miles per hour . two hours later train в leaves the same station traveling in the same direction at 42 miles per hour . how many miles from the station was train a overtaken by train b ? 
Options: a ) 150 , b ) 170 , c ) 190 , d ) 210 , e ) 230
Output (English): d