Question 404209
A 50 km/h
...
50% of A = 25 km/h
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B travels at 75km/h
..
B starts at 10 am.
A starts at 9 am
..
A travels 50 km in 1 hour

..
when B starts they are 300 -50 km apart.
=250km.

Speed together  = 50+75 = 125 km/h

Time = distance /speed
Time =250/125
Time = 2hours to meet.
They meet at 12.00 noon