Solution:

Either your read from start or from ends, it will be same

Solution:

Chicago

Solution:

A green paint off-course :p

Solution:

I filled a glass full of water and held it over my head for 20 minutes.

Solution:

One Minute building

building 62 => Sixty second building => One minute building

Solution:

Forty

Solution:

0! or cos(0)

Solution:

245 minutes

It will take 49 cuts not 50.
so 49*5 => 245 minutes

Solution:

24miles/hr (not 25miles/hr which might be guessed by many)

D : distance traveled
T1 : time of going to office
T2 : time of returning back
Y : Average Speed

D = 20 * T1
T1 = D/20

D = 30 * T2
T2 = D/30


2D = Y(T2 + T1)
2D = Y(D/20 + D/30)
2D = Y(3D/60 + 2D/60)
2D = Y(5D/60)
Y = 120D/5D

=> Y = 24

Solution:

Old password : altered

New Password : distinct