Question

Because of heavy traffic, a bus took 30 minutes to cover a distance of 20 city blocks. How many minutes per city block did the bus move?

Answer 1

a bus took 30 minutes-------------------------- to cover a distance of 20 city blocks

   X minutes------------------------------------------------one (1) city block

 I apply a rule of three

X=(1)*(30)/20=1.5 

 Therefore

 the bus moved 1.5 minutes/block city