A car moves at an average speed of 30kmh ?1 , how long does it
MATHEMATICS
WAEC 2000
A car moves at an average speed of 30kmh?1, how long does it take to cover 200 meters?
- A. 2.4 sec
- B. 24 sec
- C. 144 sec
- D. 240 sec
Correct Answer: B. 24 sec
Explanation
Speed = 30 kmh\(^{-1}\)
= \(\frac{30 \times 1000}{3600}\)
= \(\frac{25}{3} ms^{-1}\)
Time = \(\frac{Distance}{Speed}\)
= \(\frac{200}{\frac{25}{3}}\)
= \(\frac{200 \times 3}{25}\)
= 24 seconds
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