Question 718806
In terms of just units:
( feet / sec ) x ( sec/min ) x ( min/hr ) x ( miles/ ft ) = miles / hr
To check you can rewrite it like this:
( ft/ft ) x ( sec/sec ) x ( min/min ) x ( miles/hr ) = miles/hr
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{{{ ( 110/5 )*( 60/1 )*( 60/1 )*( 1/5280 ) }}}
{{{ 22*60*60*( 1/5280 ) }}}
{{{ 79200 / 5280 = 15 }}}
The boat's speed is 15 mi/hr