1.

During the first `18 min` of a `60 min` trip, a car has an average speed of `11 ms^-1.` What should be the average speed for remaining `42 min` so that car is having an average speed of `21 ms^-1` for the entire trip?A. `25.3 ms^(-1)`B. `29.2 ms^(-1)`C. `31 ms^(-1)`D. `35.6 ms^(-1)`

Answer» Correct Answer - A
`21=(11xx18+42xx upsilon)/(60)`
`therefore upsilon = 25.3 ms^(-1)`


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