Pat's watch gains an extra 6 seconds every 4 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 84 hours, what will be the difference in time between Pat's watch and Kim's watch? Choose the correct option.
A) 8 min 26 sec
B) 7 min 26 sec
C) 6 min 26 sec
D) 5 min 26 sec
E) 4 min 26 sec
In 84 hours Pat's watch will gain an extra   84/4*6= 
<gadget id="calculator">  84/4*6</gadget>
<output>126</output>
126 seconds.   In 84 hours Kim's watch will lose   84/3*5= 
<gadget id="calculator">  84/3*5</gadget>
<output>140</output>
140 seconds.   Hence the difference will be   126 + 140= 
<gadget id="calculator">  126 + 140</gadget>
<output>266</output>
266 sec.   Answer: 4 min 26 sec.
<result>E</result>
Pat's watch gains an extra 6 seconds every 4 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 84 hours, what will be the difference in time between Pat's watch and Kim's watch?