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A car moves at an average speed of 30kmh -1 how... - WAEC Mathematics 2000 Question

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 option: b

Speed = 30 kmh $^{- 1}$

= $\frac{30 \times 1000}{3600}$

= $\frac{25}{3} m s^{- 1}$

Time = $\frac{D i s t a n c e}{S p e e d}$

= $\frac{200}{\frac{25}{3}}$

= $\frac{200 \times 3}{25}$

= 24 seconds

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