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Q 2261134025.     Manish travels at the speed of `40` km/h for `3` h and at the speed of `60` km/h for `4. 5` h. In this way he covers three-fifths of the total distance. At what average speed should he travel to cover the remaining distance in `4` h?
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)