Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 60 hours, what will be the difference in time between Pat's watch and Kim's watch?  Choose the correct choice from the following options
A) 2 min 40 sec B) 3 min 40 sec C) 4 min 40 sec D) 5 min 40 sec E) 6 min 40 sec
In 60 hours Pat's watch will gain an extra   60/2*10= 
<gadget id="calculator">  60/2*10</gadget>
<output>300</output>
300 seconds.   In 60 hours Kim's watch will lose   60/3*5= 
<gadget id="calculator">  60/3*5</gadget>
<output>100</output>
100 seconds.   Hence the difference will be   300 + 100= 
<gadget id="calculator">  300 + 100</gadget>
<output>400</output>
400 seconds.   Answer: 6 min 40 sec.
<result>E</result>
Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 60 hours, what will be the difference in time between Pat's watch and Kim's watch?