How do you go from 98 to 720 using just one letter?

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

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

What has a ring but no finger?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

You see me once in June, twice in November, and not at all in May. What am I?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?