Answer is B: 150
write two equations
r+s=190
4r+3s=720
solve by substitution
the get r=150 s=40

We have x and y intercept:
(2, 0) and (0, 3).
Substitute the coordinates of points to the equation:

Hello there!
If:
110....> 8 seconds
x........32 seconds
Cross multiply
8 * x = 32 * 110
8x = 3520
x = 3520/8
x= 440
It makes 440 rotations in 32 seconds
I hope this helps!
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