If you are time bound then please avoid radio taxis, I have had bad experience with radio taxis in Delhi, one company cancelled just 15 minutes...
If your going to be taking the HoHo bus you will cover near enough all of the attractions, and just to let you know there are two routes which...
In Agra the main attraction is Taj Mahal which takes around a good two hours to see, then you have the Agra Fort which would take around an hour...
I have been on this road trip a couple of years back, and I would like to recommend you making stopovers at Manali and Sarchu.
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