Task: Question Answering
Input (English): Problem: david and lewis leave chennai for hyderabad simultaneously at 8 p . m in the night driving in two cars at speeds of 50 mph and 70 mph respectively . as soon as lewis reaches hyderabad he returns back to chennai along the same route and meets david on the way back . if the distance between the two cities is 350 miles , how far from chennai did david and lewis meet ? 
Options: a ) 250 miles , b ) 240 miles , c ) 230 miles , d ) 235 miles , e ) 75 miles
Output (English): a