Two bicycle wheels, A and B, start rotating at constant speeds at the same time. How many seconds after the wheels...

Source: Princeton Review

Two bicycle wheels, A and B, start rotating at constant speeds at the same time. How many seconds after the wheels start rotating will wheel B have made 6 rotations than wheel A?

1) The rate of rotation of wheel B is three times that of wheel A
2) The two wheels average 40 revolutions per minute

The OA is C

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