Step 1: Understanding the Situation
Ajay reached the bus stop at 8.40 a.m., and it takes him 10 minutes to reach there. He left home 15 minutes earlier than usual.
Step 2: Calculating the Usual Time
If Ajay reaches the bus stop at 8.40 a.m. and takes 10 minutes to reach there, he must have left home at 8.30 a.m.
Step 3: Determining the Time He Left Home
Since he left home 15 minutes earlier than usual, he must have left home at 8.30 a.m. (the usual time to leave).
Thus, the correct answer is (2) 8.45 a.m..