GK 2015 Q6
6. A cyclist rides at 5 metres per second. The wheels of his bicycle have a circumference of 125 cm. How many complete turns does each wheel make in 5 seconds?
- A 4
- B 5
- C 10
- D 20
- E 25
Grey Kangaroo 2015, Question 6. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: D 20
In five seconds, the cyclist will have travelled 5 × 5 m = 25 m. Hence the wheels will have made 25 ÷ 1.25 = 20 complete turns.
Solution © UK Mathematics Trust, from the GK 2015 solutions.