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A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?
- a)30 km per hour
- b)35 km per hour
- c)40 km per hour
- d)45 km per hour
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A car has an average speed of 60 km per hour while going from Delhi to...
Let the distance between Delhi and Agra be D km
Time taken for round journey = D/60 + D/y [∵ Time = Distance/Speed]
⇒ D(60 + y) / (60y) = 2D/Average speed
⇒ 2 × 60y = Average speed × (60 + y)
120y = 48 × (60 + y)
120y = 2880 + 48y
72y = 2880
∴ y = 40 km/h
⇒ D(60 + y) / (60y) = 2D/Average speed
⇒ 2 × 60y = Average speed × (60 + y)
120y = 48 × (60 + y)
120y = 2880 + 48y
72y = 2880
∴ y = 40 km/h
Most Upvoted Answer
A car has an average speed of 60 km per hour while going from Delhi to...
Solution:
Given, Average speed of the car while going from Delhi to Agra = 60 kmph
Let the distance between Delhi and Agra be 'd'
Therefore, time taken to travel from Delhi to Agra = d/60
Let the average speed of the car while returning from Agra to Delhi be 'y'
Therefore, time taken to travel from Agra to Delhi = d/y
Total time taken for the whole journey = (d/60) + (d/y)
Average speed of the car for the whole journey = Total distance travelled/Total time taken
Therefore, 48 = 2d/[(d/60) + (d/y)]
48 = 2/[(1/60) + (1/y)]
24 = (1/60) + (1/y)
(1/y) = (24 - 1/60)
(1/y) = (1439/60*24)
y = 40 kmph
Therefore, the value of y is 40 kmph.
Given, Average speed of the car while going from Delhi to Agra = 60 kmph
Let the distance between Delhi and Agra be 'd'
Therefore, time taken to travel from Delhi to Agra = d/60
Let the average speed of the car while returning from Agra to Delhi be 'y'
Therefore, time taken to travel from Agra to Delhi = d/y
Total time taken for the whole journey = (d/60) + (d/y)
Average speed of the car for the whole journey = Total distance travelled/Total time taken
Therefore, 48 = 2d/[(d/60) + (d/y)]
48 = 2/[(1/60) + (1/y)]
24 = (1/60) + (1/y)
(1/y) = (24 - 1/60)
(1/y) = (1439/60*24)
y = 40 kmph
Therefore, the value of y is 40 kmph.
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A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer?
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A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer?.
A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, what is the value of y?a)30 km per hourb)35 km per hourc)40 km per hourd)45 km per hourCorrect answer is option 'C'. Can you explain this answer?.
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