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 5 more revolutions than gear P?  Options: A) 6 B) 8 C) 10 D) 12 E) 15
Gear Q makes 30 more revolutions each 60 seconds.   The time to make 5 = 30/6 more revolutions is 60/6= 
<gadget id="calculator">60/6</gadget>
<output>10</output>
10 seconds.   The answer is 10.
<result>C</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 5 more revolutions than gear P?