A train travels 60km in M minutes. If its average speed is 400km per hour,...
MATHEMATICS
WAEC 2008
A train travels 60km in M minutes. If its average speed is 400km per hour, find the value of M
- A. 15
- B. 12
- C. 10
- D. 9
Correct Answer: D. 9
Explanation
Average speed = \(\frac{Distance}{Time}\)
\(\frac{400km}{hr} = \frac{60km}{Time}\)
Time = \(\frac{60km}{400 km/hr}\)
= \(\frac{60hr}{400}\)
M = \(\frac{60hr}{400} \times \frac{60min}{1hr}\)
= 9 minutes
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