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During the first 18 min of a 60 min trip...

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)`

Text Solution

Verified by Experts

The correct Answer is:
A
`21=(11xx18+42xx upsilon)/(60)`
`therefore upsilon = 25.3 ms^(-1)`
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