Task: Question Answering
Input (English): Problem: if two projectiles are launched at the same moment from 1455 km apart and travel directly towards each other at 470 km per hour and 500 km per hour respectively , how many minutes will it take for them to meet ? 
Options: a ) 90 , b ) 85 , c ) 80 , d ) 75 , e ) 70
Output (English): a