Pravi moves on a straight road from point A to point C. She takes 30 minutes to cover a certain distance AB and 40 minutes to cover the rest of distance
BC. She then turns back and takes 40 minutes to cover the distance CB and
30 minutes to cover the rest of the distance to her starting point. She makes 5 rounds
on the road the same way. Pravi concludes that her motion is
A Rectilinear motion only
B Periodic motion only
C Rectilinear and periodic both
D Neither rectilinear nor periodic.
explain answer