Task: Question Answering
Input (English): Problem: a can go round a circular path 8 times in 40 minutes . if the diameter of the circle is increased to 10 times the original diameter , then the time required by a to go round the new path once , travelling at the same speed as before is 
Options: a ) 20 min , b ) 35 min , c ) 50 min , d ) 70 min , e ) none
Output (English): c