exam Maths Puzzle Numerical Ability

can someone please help me with these problems.

The posted speed limit for trucks along national route 3 is 35mph. how many kilometers will a convoy cover after 3.7 hours on the

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exam Other Question
Find the length x. Express your answer in simplified radical form.
51 ft, x, 45 ft Subtract and write in simplest form:

12 10
---- - ----
z z

I believe the answer is:
2
---
z^2

Is this correct? Thank you