WAEC - Mathematics (2000 - No. 12)
A car moves at an average speed of 30kmh\(^{-1}\), how long does it take to cover 200 meters?
2.4 sec
24 sec
144 sec
240 sec
설명
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