MTO-SAP Financial Accounting Interview Question:

Say you are driving on one-mile track. You do one lap at 30 miles an hour. How fast do you have to go to average 60 miles an hour?

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This is something of a trick question, and was recently received by a Goldman candidate. The first thought of many people is to say 90 miles an hour, but consider: If you have done a lap at 30 miles an hour, you have already taken two minutes. Two minutes is the total amount of time you would have to take in order to average 60 miles an hour. Therefore, you can not average 60 miles an hour over the two laps.
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