book Maths Puzzle Numerical Ability

Can someone help me with this problem?

Fir the circumference of a circle. The radius is 12 ft. Use 3.14 for pi and round the answer to one decimal place.
Thank you,
Sher

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book Other Question

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? This question is on elimination...and it is also my last question... i just wanted you to check my answers to make sure that they were right.
-1/3x-4/3y=-2
1/3x-2/3y=4

My answer was (4,-4) Is this right?
thank you so so much!~