Devontre rode his bike uphill 5 miles and then back downhill. The rate at which Devontre traveled downhill was 20 mph faster tha
n his rate going uphill. If it took him 20 minutes longer to ride uphill than downhill, what was his uphill rate?
1 answer:
Answer:
10 mph
Step-by-step explanation:
Let x mph be Devontre rate uphill, then x+20 mph its his rate downhill.
1. Time uphill:
2. Time downhill:
3. If it took him 20 minutes (1/3 hour) longer to ride uphill than downhill, then
Solve this equation:
The rate cannot be negative, thus, x=10 mph (rate uphill).
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