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The speed of the train in going from Kanpur to Lucknow is 60km/hr while when coming back from Lucknow to Kanpur, its speed is 40 km/hr. Find the average speed (in km/hr) during the whole journey.

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Important Questions on Average

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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 21
The average weight of class of 19 students is 20 kg. If the weight of the teacher be included, the average rises by 1 kg. What is the weight of the teacher?
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 22
The average of 3 numbers is 20 and that of the first two is 25. Find the third number.
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CAT
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 23
The average weight of 29 men in a ship is increased by 5 kg when one of the men, who weighs 120 kg, is replaced by a new man. Find the weight of the new man (in kg).
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CAT
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 24
The age of A and B is the ratio 1:3. After 10 years, the ratio of their ages will become 1:2. Find the average of their ages after 20 years.
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CAT
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 25
Find the average of the first 100 natural numbers.
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CAT
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 26

Find the average of all prime numbers between 20 and 50.

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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 27
If we take four numbers, the average of the first three is 20 and that of the last three is 25. If the last number is 30, the first number is
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CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 28
The average of 15 results is 40 and that of 25 more result is 48. For all the results taken together, the average is