( a + 2016b ) = 2017  or ( a + 2016b ) 2017

???

Have : 1/1.3 + 1/3.5 + 1/5.7 + ... + 1/99.101

   =>   1/2 ( 2/1 . 3 + 2/3.5 + 2/5.7 + ... + 2/99.101 )

           1/2 ( 1 - 1/3 + 1/3 + 1/5 - 1/5 + 1/7 - 1/7 + .... - 1/99 + 1/101 ) 

           1/2 ( 1 - 1/101 )

            1/2 . 100/101

     => 50/101

Land  S = 1.2 + 2.3 + 3.4 + 4.5 + ... + 199.200

=> 3S = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + 3.4.5 - 3.4.5 + .... + 199.200.201

      3S = 199.200.201

        S = 199.200.201/3 = 2666600

The worker make three tools out of time is :

   12 hours - 7 hours 30 minute = 4 hours 30 minute = 4,5 hours

The worker makes 1 product time out is :

   4,5 : 3 = 1,5 ( hours ) = 1 hours 30 minute

     Answer : 1 hours 30 minute