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  • Question
  • Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop?


  • Options
  • A. 15 minutes
  • B. 20 minutes
  • C. 18 minutes
  • D. 22 minutes

  • Correct Answer
  • 20 minutes 

    Explanation

    Let the total distance to be covered is 84 kms.
    Time taken to cover the distance without stoppage = 84/42 hrs = 2 hrs
    Time taken to cover the distance with stoppage = 84/28 = 3 hrs.
    Thus, he takes 60 minutes to cover the same distance with stoppage.
    Therefore, in 1 hour he stops for 20 minutes.


  • Average problems


    Search Results


    • 1. The mean of 100 observations is 40. It is found that an observation 84 was misread as 48. Then the correct mean is ?

    • Options
    • A. 40.36
    • B. 41.24
    • C. 41.92
    • D. 42.05
    • Discuss
    • 2. David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics,Physics, Chemistry and Biology What are his average marks ?

    • Options
    • A. 75
    • B. 68
    • C. 65
    • D. 60
    • Discuss
    • 3. In a mens hostel, there were 95 students. To accommodate 30 more students the average is decreased by rupees 5. But total expenditure increased by Rs.500. Find the total expenditure of the hostel now ?

    • Options
    • A. Rs. 4680
    • B. Rs. 4420
    • C. Rs. 4960
    • D. Rs. 5480
    • Discuss
    • 4. The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3:5:7, the price of the cheapest item is :

    • Options
    • A. 6000
    • B. 7000
    • C. 8888
    • D. 9000
    • Discuss
    • 5. The average of 9 results is 50. The average of the first four results is 52 and the average of the last four results is 49. what is the fifth result?

    • Options
    • A. 48
    • B. 46
    • C. 52
    • D. 44
    • Discuss
    • 6. The average age of 7 boys is increased by 1 year when one of tem whose age is replaced by a girl. What is the age of the girl ?

    • Options
    • A. 33 yrs
    • B. 27 yrs
    • C. 21 yrs
    • D. 29 yrs
    • Discuss
    • 7. In Arun's opinion, his weight is greater than 65 kg but leas than 72 kg. His brother does not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of diferent probable weights of Arun ?

    • Options
    • A. 55.5 kg
    • B. 66.5 kg
    • C. 77.5 kg
    • D. 88.5 kg
    • Discuss
    • 8. The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years, The age of the 15th student is :

    • Options
    • A. 11
    • B. 12
    • C. 13
    • D. 14
    • Discuss
    • 9. The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ?

    • Options
    • A. 84 km/hr
    • B. 96 km/hr
    • C. 72 km/hr
    • D. 60 km/hr
    • Discuss
    • 10. Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56, what will be the sum of the highest number and the lowest number?

    • Options
    • A. 120
    • B. 160
    • C. 80
    • D. 60
    • Discuss


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