If a heavy-load trailer traveled $$7$$ miles in $$1$$ hour and $$10$$ minutes, what was its speed in miles per hour?

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If a heavy-load trailer traveled $$7$$ miles in $$1$$ hour and $$10$$ minutes, what was its speed in miles per hour?

by BTGmoderatorLU » Thu Jun 01, 2023 5:01 pm

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Source: Princeton Review

If a heavy-load trailer traveled $$7$$ miles in $$1$$ hour and $$10$$ minutes, what was its speed in miles per hour?

A. $$6$$
B. $$6.5$$
C. $$8$$
D. $$8.5$$
E. $$10$$

The OA is A

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Re: If a heavy-load trailer traveled $$7$$ miles in $$1$$ hour and $$10$$ minutes, what was its speed in miles per hour?

by GMATJourneyman » Fri Jun 02, 2023 7:44 am
BTGmoderatorLU wrote:
Thu Jun 01, 2023 5:01 pm
Source: Princeton Review

If a heavy-load trailer traveled $$7$$ miles in $$1$$ hour and $$10$$ minutes, what was its speed in miles per hour?

A. $$6$$
B. $$6.5$$
C. $$8$$
D. $$8.5$$
E. $$10$$

The OA is A
The trailer went 7 miles in 1 hour and 10 minutes. We want to find out how fast it was going, right? But in miles per hour, not miles per minute.

So first thing is, we have to turn that 10 minutes into a fraction of an hour. Since there are 60 minutes in an hour, the 10 minutes is 10/60 = 1/6th of an hour, or about 0.16667 of an hour.

Now we've got 1 hour and a bit... specifically 1.16667 hours.

Next, we need to work out the speed. And speed is just how far you go divided by how long you take.

So we take the 7 miles and divide it by our 1.16667 hours. When you do the maths, it comes out to about 6.

So the answer is A: 6 miles per hour.

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