A question -- if two Bricklins...

["K M" <symbiotic@hotmail.com>]

Fill in please. If two Bricklins, each going 60 mph, have a head-on 
collision, that is like one Bricklin running into a brick wall at (how many 
mph)? Thanks, it will settle a debate, and it doesn't have to be Bricklins 
but it does have to be two moving, equal masses hitting head to head and the 
wall has to be immovable. Thanks, Kim.