Question 665693
Let B's rate be x
A's rate = 2x

They are waling towards each other. So their combined rate = 2x+x=3x

distance = 37.5 miles

time = 5

speed = distance / time

3x= 37.5/5

multiply equation by 5
15x= 37.5 
/15
x= 37.5/15
x= 2.5 mph

B's walking rate = 2.5 mph
A's walking rate = 2.5*2 = 5 mph

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