Just to add to barnabys solutions. For question 2 (ROD) you can halve the ground speed and add a zero for the answer. (3 deg glide slope only)
ie required rod on a 3 deg glide, gs 100 kts. 100/2=50, add a zero...500 fpm
or for a change in head/tail wind ie 10kts. 10/2=5, add a zero...50 fpm
May save you a few seconds in the exam
