Task: Question Answering
Input (English): Problem: a boat can travel with a speed of 22 km / hr in still water. if the speed of the stream is 5 km / hr, find the time taken by the boat to go 135 km downstream
Options: a. 5 hours, b. 4 hours, c. 3 hours, d. 2 hours, e. none of these
Output (English): a