Hi siriusvj,

This question can be solved by TESTing THE ANSWERS.

We're given Youseff's rate to walk (1 minute/block) and bike (20 seconds/block = 1/3 minute/block) to work. We're also told that the DIFFERENCE in those two times is exactly 10 minutes. We're asked for the number of blocks between Youseff's home and work.

Since the DIFFERENCE is 10 minutes, and the walking rate is 1 minute/block, there MUST be MORE than 10 blocks (since 10 blocks = 10 minutes to walk and it takes a certain amount of time to bike, so the difference in time would be less than 10 minutes).

Let's TEST Answer D:

IF....15 blocks....

15(1 min/block) = 15 minutes to walk

15(1/3 min/block) = 5 minutes to bike

The difference IS 10 minutes, which is a MATCH for what we were told, so this MUST be the answer.

Final Answer:

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Rich

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