It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What has 88 keys?

Can you decipher the two rows to find the hidden word?

Can you make four (4) nines (9) equal 100?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

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

I taste better than I can smell. Who am I?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____