Which is the rope you never skip with?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Which five letter word can be added at the end of below word to form a
valid word?

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A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Replace the question mark with the number below given a simple math problem.