Ok so like ratios in physics are so confusing can anyone help?

Kay so . In an experiment similar to Investigation 6.6, two dynamics carts are at rest with a compressed spring between them. When the spring is allowed to expand, the carts move apart. Both hit bricks at either end of the table, simultaneously, but cart A moves 0.60 m while cart B moves 0.90m. What is the ratio of :
a) the speed of A to the speed of B after the explosion?
b) their masses?
c) the impulse applied to the carts?
d) the accelerations of the carts while the spring was pushing them apart.

ANSWERS:

a)

0.67

b) 1.5

c) 1.0

d) 0.67

Kay so I understand a is 0.6 / 0.9

but then why is b = 0.9/0.6?
Lool
and the rest are just confusing.
 
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