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MP Police SI Ages — practice questions — page 2

Explore 33 free Ages questions in MP Police SI Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Ages questions and exercises with answers

Showing questions 31–33 of 33.

A man travels equal distances at 40 km per hour and at 60 km per hour. His average speed is:Read the answer and worked solution →A man covers a distance in 6 hours at 40 km per hour. To cover it in 4 hours he must travel at:Read the answer and worked solution →A car uses 4 litres of petrol for 60 km. Its mileage in km per litre is:Read the answer and worked solution →

Worked practice questions

A man travels equal distances at 40 km per hour and at 60 km per hour. His average speed is:

  1. 46 km per hour
  2. 48 km per hour
  3. 50 km per hour
  4. 52 km per hour
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Correct answer: B. 48 km per hour

1. Average speed is total distance divided by total time, never the mean of the two speeds. 2. Take each leg as 120 km, a convenient common multiple. 3. The first leg takes 120 / 40 = 3 hours and the second 120 / 60 = 2 hours. 4. So 240 km takes 5 hours. 5. The average speed is 240 / 5 = 48 km per hour. Answering 50 is the mean-of-speeds trap, and it is always too high. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_

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A man covers a distance in 6 hours at 40 km per hour. To cover it in 4 hours he must travel at:

  1. 50 km per hour
  2. 55 km per hour
  3. 65 km per hour
  4. 60 km per hour
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Correct answer: D. 60 km per hour

1. First find the distance: 40 x 6 = 240 km. 2. The distance does not change, so speed and time are in inverse proportion. 3. The required speed is 240 / 4. 4. That is 60 km per hour. 5. Checking the ratio, the time fell to two thirds, so the speed must rise to three halves: 40 x 3 / 2 = 60. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_

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A car uses 4 litres of petrol for 60 km. Its mileage in km per litre is:

  1. 12
  2. 18
  3. 15
  4. 20
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Correct answer: C. 15

1. Mileage is distance divided by fuel used. 2. Here that is 60 km for 4 litres. 3. So the mileage is 60 / 4. 4. That is 15 km per litre. 5. This constant ratio is what makes distance and petrol directly proportional: 12 litres would carry the car 180 km. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.2 Direct Proportion_

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More Quantitative Aptitude topics

MensurationMultiplicationNumber PropertiesSimple InterestSquares And RootsPercentagesNumber SystemRatio and Proportion