Q. A car travelling at a speed of 40 km/hour can complete a journey in 9 hours. How long will it take to travel the same distance at 60 km/hour?
Answer: 6 hours
Notes: Total distance covered = speed $latex \times$ Time =40$latex \times$9 = 360km/hr The required time at 60 kmph = 360$latex \div$60=6 hours. Hence option [D] is the right answer.

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