Question 190286
First, determine the distance (in miles) of 18 city blocks:
3 blocks=1 mile
18/3 = no of miles (18 blocks)

Speed= distance/time

distance= 18/3 miles
time = 9 minutes

{{{(18/3)/9=speed}}}
{{{speed = (2/3) miles per minute}}}

There are 60 minutes in an hour:

2/3 * 60 = 40 miles per hour