You doubled a number to get 188 so in reverse, you would divide by 2 so 188/2 = <<188/2=94>>94
You added 4 to this number and in reverse, you would subtract by 4 so 94-4= <<94-4=90>>90
You doubled a number to get 90 so in reverse you would divide by 2 so 90/2 = <<90/2=45>>45 is the fastest speed
#### 45