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A train travels first 300 km at an avera...

A train travels first 300 km at an average rate of 30 km per hour and further travels the same distance at an average rate of 60 km per hour, then the average speed over the whole distance is

A

35 km per hour

B

40 km per hour

C

42 km per hour

D

45 km per hour

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The correct Answer is:
B
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MCGROW HILL PUBLICATION-STATISTICS -MULTIPLE CHOICE QUESTIONS
  1. Find the mean of first five prime numbers

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  2. The algebraic sum of the deviations of a set of value of a data from t...

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  3. A train travels first 300 km at an average rate of 30 km per hour and ...

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  4. The average age of a group of 8 members is same as it was 3 years ago,...

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  5. The mean of ten items is 17 and if each item is increased by 5, then t...

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  6. The mean of 20 items of a data is 5 and if each item is multiplied by ...

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  7. The numbers 3, 5, 6 and 4 have frequencies of x, x + 2, x -8 and x+ 6,...

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  8. The weights of 9 apples are 50, 60, 65, 62, 67, 70, 64, 45, 48 grams ....

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  9. The mean of all the factors of 12 is

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  10. The arithmetic mean of 6, 10, x and 12 is 8 . The value of x is

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  11. The mean of first 8 natural numbers is

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  12. The mean of 6 numbers is 20. If one number is deleted, their mean is 1...

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  13. The sum of the deviations of the variates 6, 8, 10, 16, 20, 24

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  14. The mean of 20 numbers is 9. If 3 is added to every number what will b...

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  15. The mean of 8 numbers is 25. If each number is multiplied by 2, the ne...

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  16. The mean age of combined group of men and women is 35 years. If the me...

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  17. The median of the first 12 prime numbers is

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  18. Out of a total of 20 observations arranged is ascending order 10^(th) ...

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  19. Mode of the distribution is that value of the variate for which the i...

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  20. There are 50 numbers. Each number is subtracted from 53 and the mean o...

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