What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Before Mount Everest was discovered, what was the highest mountain in the world?

Solve below rebus puzzle?

Rearrange the letters in "new door" to make one word.

Our product and our sum always give the same answer. Who are we?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?