I am the fastest animal but cannot climb the tree. What am I?

Find the missing letter in the last circle logically in the given below picture.

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Count the number of triangles in the below picture?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Solve the counting riddle by identifying the number of triangles in the given picture.

If a wheel has 54 spokes, how many spaces are there between the spokes?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?