Problem 2 · 2011 Math Kangaroo
Easy
Ratios, Rates & Proportions
distance-speed-time
A motorcycle driver covers a distance of 28 km in 30 minutes. What was his average speed in km/h?
Show answer
Answer: C — 56
Show hints
Hint 1 of 2
Average speed is distance divided by time, in the right units.
Still stuck? Show hint 2 →
Hint 2 of 2
30 minutes is half an hour, so think about how far he goes in a full hour.
Show solution
Approach: speed = distance / time
- He travels 28 km in 30 minutes, which is half an hour.
- In a full hour he would cover twice as far: 2 × 28 = 56 km.
- So his average speed is 56 km/h.
Mark:
· log in to save