Bill travels west on Interstate 80 from Summerville. Sally leaves Carlton City and travels on I-80 in the same direction as Bill. Bill's distance in miles from Metro City is given byB (t) = 120 - 60tand Sally's distance in miles from Metro City is given byS (t) = 135 - 70, where t is the number of hours since noon. Write an expression for the distance separating Bill and Sally and find their separation at 2:00 PM.
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