A man drives a car at 40 km/h for 3 hour...

A man drives a car at `40` km/h for `3` hours and at a speed of `60` km/h for next `4.5` hours. After that he finds that he has covered only `3/5` of the total distance. Then find the speed of the car if he has to cover the remaining distance in `4` hours.

`66` km/h

`65` km/h

`64` km/h

`62` km/h

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