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AB Movement Speed Problem

.xlsx Spreadsheet (13k)

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Description
 
A and B move at speeds of 500 units per second and 400 units per second respectively.
 
BUT
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