1.
A person
travels along a straight road for the first half time with a velocity 
and the next half time
with a velocity 
. The mean velocity 
of the man is
and the next half time
with a velocity . The mean velocity of the man is
[RPET 1999; BHU 2002]
(a) 
(b) 
(b)
(c) 
(d) 
(d)
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