exam Maths Puzzle Numerical Ability

Is this rational or irrational:

sqrt -

I believe this is irrational because there is no numbers involved in this, am I correct? Thank you very much!

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exam Other Question

i have 3 questions.

1) 7 times the difference between d and 11
2) The number s divided by the sum of t and u
3) the number r added to the product of a and c

thank you. The speed of train A is 12 km/h slower than the speed of train B. Train A travels 230 km in the same time it takes train B to travel 290 km. Find the speed of each.