exam Maths Puzzle Numerical Ability

For what value(s) of k the lines y=(k+1)x-3 and (2k-1)x+1 are parallel and are perpendicular?

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exam Other Question
With a certain tail wind a jet air craft arrives at its destination 1,890 miles away in 3 hours. Flying against the same wind, the plane makes the return trip in 3 3/8 hours. Find the windspeed and airspeed. i would really appriciate help with this problem sqrt(243)/sqrt(3)

so far i have 9sqrt3 times sqrt(3)/sqrt(3) times sqrt(3)

what i dont get is how to multiply the top part





thank you