Interview Riddles

Interview riddles are famous questions asked during interviews by some big companies like Google, Microsoft, Intel etc.

Rickety Rope Bridge

Four people need to cross a rickety rope bridge to get back to their camp at night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. Each of the campers walks at a different speed. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the fourth takes 10 minutes to cross.

How do the campers cross the bridge in 17 minutes?

Riddle Answer

Frog in 30 Meter Well

A frog is at the bottom of a 30 meter well. Each day he summons enough energy for one 3 meter leap up the well.

Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards.

How many days does it take him to escape from the well?

Riddle Answer

Hanging Cable

A cable of 80m (meters) is hanging from the top of two poles that are both 50m from the ground.

hanging cable between 2 poles

What is the distance between the two poles, to one decimal place, if the center of the cable is 10m above the ground?

Riddle Answer

Red and Blue Marbles

Your friend has 100 red marbles, 100 blue marbles and 2 jars.

He proposes a game. He fills the jars with the marbles, put the two jars behind his back and tell you to pick one of them at random. You’ll then close your eyes, he’ll hand you the jar you picked, and you’ll pick a random marble from that jar.

You win if the marble you pick is blue, and you lose otherwise.

To give you the best shot at winning, your friend gives you the two jars before the game starts and says you can move the marbles around however you’d like, as long as all 200 marbles are in one of the 2 jars (that is, you can’t throw any marbles away).

How should you move the marbles around to give yourself the best chance of picking a blue marble?

Riddle Answer

Clock Strike 12

At six o’clock the wall clock struck 6 times. Checking with my watch, I noticed that the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight?

Riddle Answer

Interview Riddles

Rickety Rope Bridge

Frog in 30 Meter Well

Hanging Cable

Red and Blue Marbles

Clock Strike 12

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