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Q.

The maximum speed of a train is 80 km/hr. It takes 10 hours to cover a distance of 400 km. The ratio of its maximum speed to its average speed is __________.

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a

3:1

b

1:3

c

1:2

d

2:1

answer is B.

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Detailed Solution

detailed_solution_thumbnail

The maximum speed of a train is 80 km/hr. It takes 10 hours to cover a distance of 400 km. The ratio of its maximum speed to its average speed is 2:1.
Average speed is defined as the ratio of the total distance travelled by a body to the total time taken.


Average speed=Total distanceTotal time taken


Average speed=400 km10 h


Average speed=40 km/hr


The ratio of maximum speed to its average speed is equal to,


Maximum speedAverage speed=80 km/hr40 km/hr 


Maximum speedAverage speed=21


The ratio of maximum speed to average speed is 2:1.

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