I have a few 9v Ni-MH batteries 200mAh.

I have two chargers one with output at 9v of 10ma and the other a very old
one that says output is 7.2v (even though its designed to take two 9v
batteries) and whose output says it is 15ma x2.

Which would be the best to use on the 9v Ni-MH and what would be roughly be
the minimum charge time to ensure batteries are fully charged please?
thanks for advice.