3. Subtract 20 min 30 sec from 30 min 20 sec
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answer is 610 because:
1)they told that to substract (20min-30sec)-(30m-20sec)
2)in this equation first we have to convert 20min and 30min into seconds so,
3)1min:30sec,so( 20×60-30)-(30×60-20)=610
:•hence proved
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