Question 833342
After 5 hrs, the number arriving would be 
{{{ f(5) }}}
After 6 hrs, the number arriving would be 
{{{ f(6) }}}
The number arriving during the 6th hr is:
{{{ f(6) - f(5) }}}
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{{{ f(6) = 2^( 6+1 ) }}}
{{{ f(6) = 2^7 }}}
{{{ f(6) = 128 }}}
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{{{ f(5) = 2^( 5+1 ) }}}
{{{ f(5) = 2^6 }}}
{{{ f(5) = 64 }}}
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{{{ f(6) - f(5) = 128 - 64 }}}
{{{ f(6) - f(5) = 64 }}}
64 customers arrived in the 6th hr