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Bunuel
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BineetaRath
I tried solving it this way but did not work, can someone please explain where I'm going wrong here:

At 10 pm, cyclist is 10 miles away from home and starts moving farther away at a speed of 3 miles/minute. so let's say he went on for x minutes. total time he has to take to complete the trip father away and then head for home os 48 minutes. So (3x further + 3x back in + 10 miles)/3 miles/minutes (which is his constant speed) should equate to 48 minutes.

So, 6x + 10 = 144 (48 x 3)

And we need to solve for 3x.

What am I doing wrong here? Should I not be taking total distance over speed?
The mistake is that 3 minutes per mile is not 3 miles per minute. It means the cyclist travels 1 mile in 3 minutes, so if he rides farther away for x minutes, he covers x/3 miles, not 3x miles. Total distance over speed is fine, but the speed/pace conversion was reversed.
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Oh! I read it as 3 miles/minute while trying to solve it in a rush - my bad! Got it, thank you!
Bunuel

The mistake is that 3 minutes per mile is not 3 miles per minute. It means the cyclist travels 1 mile in 3 minutes, so if he rides farther away for x minutes, he covers x/3 miles, not 3x miles. Total distance over speed is fine, but the speed/pace conversion was reversed.
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I like the solution - it’s helpful. I marked 6 because 3 going and coming back.
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D = 10 miles + 2x
R = 3 mins/miles
T = 10.48 - 10.00 = 48 mins
So, Total distance = T / R = 48 mins per 3 mins/miles = 16 miles
Then D=10+2x --> 16=10+2x, so 2x=16-10=6, x=3 (B)
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