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Q 2240467313.     One-fifth of a certain journey is covered at the rate of
`35 km //h`, one-fourth at the rate of `40 km//h` and rest at `45
km//h`. Find the average speed for the whole journey.
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)