Henrikh lives x blocks from his office. It takes him 1 minute per block to walk to
work and 20 seconds per block to ride his bicycle to work. If it takes him exactly
8 minutes more to walk to work than to ride his bicycle, then x equals	Choose the correct choice from the following:
A) 4  B) 7  C) 12  D) 15  E) 20
The best way would be...   Per km, he takes 40 secs extra if he walks   So he will take 8 mins or 8*60 secs in 8*60/40= 
<gadget id="calculator">8*60/40</gadget>
<output>12</output>
12 km   ANSWER:12
<result>C</result>
Henrikh lives x blocks from his office. It takes him 1 minute per block to walk to
work and 20 seconds per block to ride his bicycle to work. If it takes him exactly
8 minutes more to walk to work than to ride his bicycle, then x equals