batsmen 1 have to hit a 6 at first ball
then he must take a single to make other batsmen on the hit
field
now the second batsmen have to hit the six at last ball

by doing so, both will get 100 in the matches

hey its very nice ya
we have to think out of line in this question

Batsman1: have to hit 4 runs (remaining 3)
Batsman1: Have to hit for 3 run after getting 2 runs he would
          make himself run out at bowler end(1 rum remaining)

Batsman2: Have to hit a Six at last ball

now both are 100 and they will win
how is it

above two answers are wrong bcz in the question it i mention
that both the batman are unbeaten
In ths case u have to think expections

1st ball batsman1 hits the ball and it strikes to the halmet
which i beside wicket keeper and the batsman get 5 runs as
penalty by the fielding team

2nd ball they run 1
 nw batsman 1 have a century
3rd ball batsman 2 will hit a six...

thanks tarun

First batsman will hit 4 runs in 1 ball our of 3 balls 
remaining 2 balls. Now the first batsman again hits a ball 
(remaining 1 ball) and take 3 runs. But unfortunately he 
takes 1 run short, due to which he can just take 2 runs 
which allows him to reach a ton. Now the second batsman who 
is on 94 will hit a six on the final ball and thus he also 
makes a century. 

So hows...that. both are unbeaten and both made a century 
and also wins.

the first batsman hits a six, and then he retires hurt. the new batsman comes who faces the second ball hits it and runs, but  before reaching the other end run out; the other batsman who was on 94 facing the 3rd ball and he hits a six. so both the batsmen hits century and remain unbeaten too.
jaideep, kochi

I'll explain using names to make it interesting. Sachin and sehwag, both on 94 with the team needing 7 runs from the remaining 3 balls. Sachin scores a 6 in the 1st ball and develops a cramp. He becomes retired hurt, his score being 100*. Ganguly who steps in tries for a single in the second ball and he is run out at the bowlers end. Sehwag sends the ball flying over the fence on the last ball making his score 100* and ensuring victory to the team. Thus the team wins the match with 2 unbeaten centurions