exam Maths Puzzle Numerical Ability

50km/1h*1h/3600s*/?/=13.9

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exam Other Question

Find the equation of the line, write your answer in slope intercept.

The line goes (1,4) and is parellel to x-2y=6

I have come up with the slope, I believe it is (1/2, -3)Is this correct?
another problem..

If a bus traveled 10 km/h faster, it would take 2h less time to make a 315km trip. What is its speed?

Thanks!