A person travelled from one place to another at an average speed of 40 kilometres/hour and back to the original place at an average speed of 50 kilometres/hour. What is his average speed in kilometres/hour during the entire round-trip ?

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Submitted by examrobotsa on

Q: 136 (IAS/1995)
A person travelled from one place to another at an average speed of 40 kilometres/hour and back to the original place at an average speed of 50 kilometres/hour. What is his average speed in kilometres/hour during the entire round-trip ?
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question_subject: 

Maths

question_exam: 

IAS

stats: 

0,20,20,11,2,20,7

keywords: 

{'average speed': [0, 2, 4, 2], 'kilometres': [0, 1, 0, 1], 'distance': [0, 3, 3, 3], 'hour': [5, 5, 11, 12], 'trip': [0, 1, 0, 1]}