Ordering puzzles

Five branches, P, Q, R, S and T, are ranked 1 (best) to 5 on sales. S ranks first. T ranks above P. P ranks above Q. Q ranks above R. Which branch ranks third?

Four presentations, A, B, C and D, fill slots 1 to 4. A is before C. D is immediately after B. C is not in slot 4. What is the order?

Five deliveries, V, W, X, Y and Z, arrive one a day from Monday to Friday. W arrives on Wednesday. X arrives before V. Y arrives the day after Z. V does not arrive on Friday. On which day does Z arrive?

Five deliveries, V, W, X, Y and Z, arrive one a day from Monday to Friday. W arrives on Wednesday. X arrives before V. Y arrives the day after Z. V does not arrive on Friday. Which delivery arrives on Tuesday?

Five candidates, A, B, C, D and E, are interviewed one after another in slots 1 to 5. C is in slot 3. A is interviewed before B. D is next to C, just before or just after. E is not first or last. Who is interviewed first?

Five trainees, A, B, C, D and E, are placed in two offices: three in London and two in Leeds. A and B are in different offices. C is in Leeds. D is in the same office as A. Who is in Leeds with C?

Five colleagues, J, K, L, M and N, sit in a row of seats numbered 1 to 5 from the left. J and K sit next to each other. L sits at one end. M sits immediately to the right of N. J sits somewhere to the left of N. K is not in seat 1. Which statement must be true?

Five colleagues, J, K, L, M and N, sit in a row of seats numbered 1 to 5 from the left. J and K sit next to each other. L sits at one end. M sits immediately to the right of N. J sits somewhere to the left of N. K is not in seat 1. L is not in seat 1. Who sits in seat 3?