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

21 m/s

B

25 m/s

C

23 m/s

D

27 m/s

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Verified by Experts

The correct Answer is:

B

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