book Maths Puzzle Numerical Ability

I have worked this problem out but I am not getting the right answer. it is the point (0,1) has the distance ? from the line defined by {{{y=-2x-1}}}

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i cant remember how to form an equation from a table when the distance goes up by 12 and the weight decreases by an un-even rate. can you help me? Mrs N and Mrs B drove a total of 140 miles in 3.4 hours. Mrs N drove first at 35 mph, Mrs B drove the remainder of the trip at 45 mph. For what length of time did Mrs B drive?