A certain snail can travel at a rate of 1 text{ millimeter per second}. A children's storybook author wants to...
GMAT Two Part Analysis : (TPA) Questions
A certain snail can travel at a rate of \(1 \text{ millimeter per second}\). A children's storybook author wants to convert this rate to other units to make the description more appealing to children.
Based on the given information, select for \(\mathrm{m/day}\) the closest to the equivalent speed of the snail in meters per day and select for \(\mathrm{km/wk}\) the closest to the equivalent speed of the snail in kilometers per week. Note that \(1 \mathrm{\;meter} = 1,000 \mathrm{\;millimeters}\) and \(1 \mathrm{\;kilometer} = 1,000 \mathrm{\;meters}\). Make only two selections, one in each column.
Phase 1: Owning the Dataset
Visual Representation - Conversion Timeline
1 mm/s → [×60] → 60 mm/min → [×60] → 3,600 mm/hr → [×24] → ? mm/day → [÷1000] → ? m/day ↓ [×7 days] ↓ ? m/week → [÷1000] → ? km/week
Given Information
- Snail speed: \(1 \mathrm{millimeter\,per\,second}\)
- Conversion factors:
- \(1 \mathrm{meter} = 1,000 \mathrm{millimeters}\)
- \(1 \mathrm{kilometer} = 1,000 \mathrm{meters}\)
- Answer choices: ["0.6", "29.4", "86.4", "604.2", "4.2"]
Phase 2: Understanding the Question
We need to find TWO values:
- m/day: The snail's speed in meters per day
- km/wk: The snail's speed in kilometers per week
The key insight: We'll convert step by step through time units, then through distance units.
Phase 3: Finding the Answer
Calculating m/day
Starting with \(1 \mathrm{mm/s}\):
- Per minute: \(1 \times 60 = 60 \mathrm{mm/min}\)
- Per hour: \(60 \times 60 = 3,600 \mathrm{mm/hr}\)
- Per day: \(3,600 \times 24 = 86,400 \mathrm{mm/day}\)
Converting to meters:
- \(86,400 \mathrm{mm} \div 1,000 = 86.4 \mathrm{meters\,per\,day}\)
✓ 86.4 is in our answer choices!
Calculating km/wk
Starting with our result of \(86.4 \mathrm{m/day}\):
- Per week: \(86.4 \times 7 = 604.8 \mathrm{meters/week}\)
Converting to kilometers:
- \(604.8 \mathrm{m} \div 1,000 = 0.6048 \mathrm{km/week}\)
The closest value in our choices is 0.6
Phase 4: Solution
Final Answer:
- m/day: 86.4
- km/wk: 0.6
Our systematic conversion shows the snail travels \(86.4 \mathrm{meters}\) in a day and approximately \(0.6 \mathrm{kilometers}\) in a week - both values that match our answer choices perfectly.