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Bunuel
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Let Dj be the distance covered by Josh, Dm by Mark

Dj = Tj * Sj, Dm = Tm * Sm

Tj = 2 * Tm, Sj = 4/5 * Sm

Sum of distance covered by both while meeting = 13.

Tj * Sj + Tm * Sm = 13

Replace the values

2Tm * (4/5 Sm) + Tm * Sm = 13

8/5 * Tm * Sm + Tm * Sm = 13

Solve and you'll get (Tm * Sm) = 5.
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Here's my approach:

Mike's rate = 1
Josh's rate = 4/5 (or 0.8), but he drove twice the time, so every time Josh drives 1 he drives 8/5 (or 1.60)

So now we'd equal their rates can use the tradicional method.

Together they drive 1 + 1.6 = 2.6
Divinding the 13km per 2.6 = they met at 5
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Let the speed of Josh be 4x
Let time taken by Josh be 2t

Let the speed of Mike be 5x
Let time taken by mike be t

Since distance = 13

4x *2t + 5x *t = 13

Or

13xt = 13 or xt = 1

So distance traveled by Mike would be 5*xt which is 5 *1 i.e 5 Answer is B
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Deconstructing the Question
Total Distance = 13 miles.
Two riders: Josh (J) and Mike (M).
Target: Find the distance Mike traveled (\(d_M\)).

Step 1: Translate English to Math
Let \(r\) be rate and \(t\) be time.
1. "Josh had ridden for twice the length of time as Mike":
\(t_J = 2 \cdot t_M\)
2. "Josh rode at four-fifths of Mike's rate":
\(r_J = \frac{4}{5} \cdot r_M\)

Step 2: Relate the Distances
Distance for Mike: \(d_M = r_M \cdot t_M\)
Distance for Josh: \(d_J = r_J \cdot t_J\)

Substitute the relationships into Josh's distance equation:
\(d_J = (\frac{4}{5} r_M) \cdot (2 t_M)\)
\(d_J = \frac{8}{5} (r_M \cdot t_M)\)

Since \(r_M \cdot t_M\) is simply Mike's distance (\(d_M\)):
\(d_J = \frac{8}{5} d_M\)

Step 3: Solve for Mike's Distance
Since they meet on a 13-mile path starting from opposite ends:
\(d_M + d_J = 13\)

Substitute \(d_J\):
\(d_M + \frac{8}{5} d_M = 13\)
\(\frac{5}{5} d_M + \frac{8}{5} d_M = 13\)
\(\frac{13}{5} d_M = 13\)

Divide by 13:
\(\frac{d_M}{5} = 1\)
\(d_M = 5\)

Mike had ridden 5 miles.

Answer: B
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