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Check out our upcoming courses here. On the GRE, you will never, ever, ever, ever have to average two speeds together. Rajesh drove the miles from Springfield to Greenville at a rate of 40 mph. Then, he returned along the same route at a rate of 60 mph. What was his average speed for the entire trip?

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That answer choice is only there to trap you! This formula works every single time. Break it down into pieces to keep yourself organized:. Calculate the total distance traveled. Rajesh traveled miles in one direction, then turned around and traveled miles in the other direction. Calculate the total time. For the first half, the distance is miles and the rate is 40 mph. For the second half of the trip, the distance is miles again, and the rate is 60 mph. The total time for the entire trip is 10 hours.

Plug them into the formula:. Does it make sense that the answer is 48 mph? But how long has train B gone? If we were to write this mathematically, we would have to express the distance traveled by train B as:. We have to write t — 1 because train B starts an hour later than train A. This makes sense, because if we let t be one, that is, one hour after , then train B has gone zero miles:.

Speed Distance Time | OASC: RAF Officer and Aircrew Selection Centre

Now, what were we trying to find again? The time w hen train A and train B have traveled the same distance. In other words, we want to know when:. So, four hours after is when train A and train B have traveled the same distance. Was that so bad?

Speed, Distance & Time - Shortcuts & Tricks for Placement Tests, Job Interviews & Exams

All you need to do is break it down step by step and practice. Try this one on your own and post the answer as a comment if you think you got it right:. At the same time, train B leaves Berlin headed toward Paris at a constant speed of 50 mph. If Paris and Berlin are miles apart, then at what time will the two trains pass each other?

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Remember, if you want, you can always get extra help studying for the GRE from the experts at Test Masters. Good luck! Want more GRE example problems? Click here! Perhaps, but the question asked you to find the time when the two trains would pass each other!

Bandwidth vs speed calculator

Be careful about stopping work on a problem before you have found the solution the question asks for. Very often, numbers that are intermediate solutions rather than final solutions will appear in the answer choices as traps you should avoid. If you give me a time of day, I will be able to confirm if your answer is correct. Keep on file Card Number We do not keep any of your sensitive credit card information on file with us unless you ask us to after this purchase is complete. Full name. Your rental will be available for 30 days. Many, many thanks for your purchase.

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