Which is the rope you never skip with?

What does below Rebus say?

XLR8

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

What goes through cities and fields, but never moves?

What is the Surname of Barbie Doll?