AB Movement Speed Problem

.xlsx Spreadsheet (13k)

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A and B move at speeds of 500 units per second and 400 units per second respectively.
when A and B are 150 units apart, A MUST stop for 0.6 seconds.
If they travel for 7 seconds, how many times must A stop?
The problem is discussed at
The spreadsheet which models the problem shows that A
must stop 3 times