Please solve question number 3 in motion

Solution
q3.
1.
when motion started, 
initial separation between A and B=100 km
2.
Speed =slope of distance time graph
hence,
$v=\frac{150-0}{(2-0)}=75 km/hr$
3.
At position 150 km, and at time 2 kh , A cross B.

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