Q 2451456324.     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?

IAS 1995 Prelims
A

`45`

B

`20 sqrt 5`

C

`400//9`

D

impossible to find out unless the distance behveen the two places is known

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