Leru la mouwane le tswa mo lewatleng le apesa toropo.  Le tsaya metsotso e le 10 go apesa dimaele di le 3 tsa toropo.  Fa toropo e le bogolo jwa dimaele di le 42 go tswa kwa lewatleng go ya ntlheng e e kgatlhanong le lone, go tla tsaya metsotso e le mekae gore leru le apese toropo yotlhe?

A fog bank rolls in from the ocean to cover a city. It takes 10 minutes to cover every 3 miles of the city. If the city is 42 miles across from the oceanfront to the opposite inland edge, how many minutes will it take for the fog bank to cover the whole city?
Toropo e tla bo e apesitswe ka 42 / 3 = <<42/3=14>>14 ya metsotso e le 10. 
Ka jalo, go tla tsaya  14 * 10 = <<14*10=140>>140 metsotso gore leru le apese toropo yotlhe. 
#### 140 

The city will be covered in 42 / 3 = <<42/3=14>>14 intervals of 10 minutes.
Thus, it will take 14 * 10 = <<14*10=140>>140 minutes for the fog to cover the whole city.
#### 140