Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per minute and Gear Q makes 40 revolutions per minute. How many seconds after the gears start rotating will gear Q have made exactly 2 more revolutions than gear P?
Choose the correct choice from the following answers
A) 4	B) 8	C) 10	D) 12	E) 15
Gear Q makes 30 more revolutions each 60 seconds.   The time to make 2 = 30/15 more revolutions is 60/15= 
<gadget id="calculator">60/15</gadget>
<output>4</output>
4 seconds.   The answer is 4.
<result>A</result>
Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per minute and Gear Q makes 40 revolutions per minute. How many seconds after the gears start rotating will gear Q have made exactly 2 more revolutions than gear P?