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Jaquan passed a checkpoint jogging at a constant speed of 
9(km)/(h).
Then, 2 minutes later, Odalis passed the same checkpoint.
If Odalis runs at a constant speed of 
12(km)/(h), then how far past the checkpoint will Odalis be when they catch up to Jaquan?

km

Jaquan passed a checkpoint jogging at a constant speed of 9kmh9\frac{\text{km}}{\text{h}}. Then, 22 minutes later, Odalis passed the same checkpoint. If Odalis runs at a constant speed of 12kmh12\frac{\text{km}}{\text{h}}, then how far past the checkpoint will Odalis be when they catch up to Jaquan?\newlinekm\text{km}

Full solution

Q. Jaquan passed a checkpoint jogging at a constant speed of 9kmh9\frac{\text{km}}{\text{h}}. Then, 22 minutes later, Odalis passed the same checkpoint. If Odalis runs at a constant speed of 12kmh12\frac{\text{km}}{\text{h}}, then how far past the checkpoint will Odalis be when they catch up to Jaquan?\newlinekm\text{km}
  1. Calculate Jaquan's Distance: First, we need to determine how far Jaquan has traveled by the time Odalis starts. \newlineSince Jaquan is traveling at 9km/h9 \, \text{km/h}, we need to convert the 22 minutes into hours to calculate the distance.
  2. Convert Time to Hours: To convert 22 minutes into hours, we divide by 6060 (since there are 6060 minutes in an hour).\newline22 minutes ÷60\div 60 minutes/hour = 130\frac{1}{30} hour
  3. Calculate Jaquan's Distance: Now we calculate the distance Jaquan has traveled in 130\frac{1}{30} hour at a speed of 9km/h9\,\text{km/h}.
    Distance = Speed ×\times Time
    Distance = 9km/h×130hour9\,\text{km/h} \times \frac{1}{30}\,\text{hour}\newlineDistance = 930km=0.3km\frac{9}{30} \, \text{km} = 0.3 \, \text{km}\newlineJaquan has traveled 0.3km0.3 \, \text{km} in the 22 minutes before Odalis starts.
  4. Find Time for Odalis to Catch Up: Next, we need to find out how long it will take for Odalis to catch up to Jaquan. Since they are both moving at a constant speed, we can set up an equation where the distance Odalis travels is equal to the distance Jaquan travels plus the 0.3km0.3 \, \text{km}.
    Let tt be the time in hours it takes for Odalis to catch up to Jaquan after Odalis starts.
    Distance Odalis travels = Distance Jaquan travels + 0.3km0.3 \, \text{km}
    12km/h×t=9km/h×t+0.3km12 \, \text{km/h} \times t = 9 \, \text{km/h} \times t + 0.3 \, \text{km} \newlineNow we solve for tt.\newline12t=9t+0.312t = 9t + 0.3\newline12t9t=0.312t - 9t = 0.3\newline3t=0.33t = 0.3\newlinet=0.33t = \frac{0.3}{3} \newlinet=0.1t = 0.1 hours \newlineIt will take Odalis 0.10.1 hours to catch up to Jaquan.
  5. Calculate Odalis's Distance: Finally, we calculate the distance Odalis will have traveled in 0.10.1 hours at a speed of 1212 km/h. \newlineDistance=Speed×Time\text{Distance} = \text{Speed} \times \text{Time} \newlineDistance=12\text{Distance} = 12 km/h ×0.1\times 0.1 hour \newlineDistance=1.2\text{Distance} = 1.2 km\newlineOdalis will be 1.21.2 km past the checkpoint when they catch up to Jaquan.

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